[qt] Replaces numbered place marker %2 with %1. #12092

This PR closes #12015 in which @chen610620 suggests to replace numbered place marker %2 with %1.

Calling member functionQString::arg() on a QString object with one arbitrary numbered place marker within the range [1,99] works, because QString::arg() replaces the lowest numbered place marker in the QString object it is called on.

QString::arg documentation:

Returns a copy of this string with the lowest numbered place marker replaced by string a, i.e., %1, %2, ..., %99.

I suspect that the %2 marker is just an unfortunate typo or the remainder of a string that used to have multiple numbered place markers.

This PR replaces the numbered place marker %2 with %1 to avoid any confusion in the future.

Tested ACK 8a93543419300bd78e189429e003c8b17c1b983a

Thanks. I missed this in 6dd3a44ce2cb4480054ae0ca0960f588a9ad8d25

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