qt, docs: Fix `bitcoin-qt -version` output formatting #14521

This PR makes command line output of bitcoin-qt -version formatted in the same way as bitcoind -version output.

Before:

After:

@hebasto This screen is for "About Bitcoin Core", so I would like to have it kept as clean and professional looking as possible. There's a screen for "About Qt" under Help that you might want to look at? Although I still don't see the purpose for this. Please do not keep trying to change trivial, unnecessary things for Bitcoin Core, it's just a waste of devs time for more important improvements.

@molxyz Regarding your comment about changing "trivial" things: Isn't that a very good way for newcomers to get used to the contribution process and learn the way around the docs and the code? I certainly think so. And in the process, Bitcoin Core gets many small improvements in areas where more experienced devs rarely work. It's a win-win!

If "trivial" PRs take too much time for devs, we have a delegation problem. Reviewing "trivial" PRs could and should be delegated appropriately. Please don't scare away newcomers that want to (learn how to) contribute. I am one them.

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Conflicts

No conflicts as of last run.

An uninteresting trip into all? the different place/ways we display version information (efaf2d8):

src/qt/bitcoin-qt -version
Bitcoin Core version v0.17.99.0-efaf2d85e (64-bit)
Copyright (C) 2009-2018 The Bitcoin Core developers

Please contribute if you find Bitcoin Core useful. Visit <https://bitcoincore.org> for further information about the software.
The source code is available from <https://github.com/bitcoin/bitcoin>.

This is experimental software.
Distributed under the MIT software license, see the accompanying file COPYING or <https://opensource.org/licenses/MIT>

This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit <https://www.openssl.org> and cryptographic software written by Eric Young and UPnP software written by Thomas Bernard.

src/bitcoind -version
Bitcoin Core Daemon version v0.17.99.0-efaf2d85e
Copyright (C) 2009-2018 The Bitcoin Core developers

Please contribute if you find Bitcoin Core useful. Visit
<https://bitcoincore.org> for further information about the software.
The source code is available from <https://github.com/bitcoin/bitcoin>.

This is experimental software.
Distributed under the MIT software license, see the accompanying file COPYING
or <https://opensource.org/licenses/MIT>

This product includes software developed by the OpenSSL Project for use in the
OpenSSL Toolkit <https://www.openssl.org> and cryptographic software written by
Eric Young and UPnP software written by Thomas Bernard.

src/bitcoin-cli -version
Bitcoin Core RPC client version v0.17.99.0-efaf2d85e

About Bitcoin Core:

Command Line Options:

Debug Console:

After (This PR 368bd04):

src/qt/bitcoin-qt -version
Bitcoin Core version v0.17.99.0-c61ee8181 (64-bit)
Copyright (C) 2009-2018 The Bitcoin Core developers

Please contribute if you find Bitcoin Core useful. Visit
<https://bitcoincore.org> for further information about the software.
The source code is available from <https://github.com/bitcoin/bitcoin>.

This is experimental software.
Distributed under the MIT software license, see the accompanying file COPYING
or <https://opensource.org/licenses/MIT>

This product includes software developed by the OpenSSL Project for use in the
OpenSSL Toolkit <https://www.openssl.org> and cryptographic software written by
Eric Young and UPnP software written by Thomas Bernard.

It seems that whatever FormatParagraph is meant to be doing doesn't have much of an affect in the About Core dialog, as the output appears the same with or without this commit.

@fanquake Thank you for your review.

This PR is intended only for the -version command-line option of bitcoin-qt. "About Bitcoin Core" dialog is a resizable window, therefore it does not need FormatParagraph.

Rebased.

utACK 60ae463a68206b08faaadfbb023d7ede78fff784