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<!-- Describe the issue -->
BitcoinQT's Input selector is showing the OK button on the left side instead of the right side.
<!--- What behavior did you expect? -->
All the buttons in the app show on the right side, so they should be there, especially the OK button.
Ok button on the right.
<!--- What was the actual behavior (provide screenshots if the issue is GUI-related)? -->
Ok button on the left.
<!--- How reliably can you reproduce the issue, what are the steps to do so? -->
<!-- What version of Bitcoin Core are you using, where did you get it (website, self-compiled, etc)? -->
I'm using 0.18.0. On a x86_64 GNU/Linux Ubuntu 19.04 Gnome 3.32.1.
<!-- What type of machine are you observing the error on (OS/CPU and disk type)? -->
<!-- For the GUI-related issue on Linux provide names and versions of a distro, a desktop environment and a graphical shell (if relevant). -->
<!-- Any extra information that might be useful in the debugging process. -->
<!--- This is normally the contents of a `debug.log` or `config.log` file. Raw text or a link to a pastebin type site are preferred. -->
