Revert "Bump API version"

This reverts commit c54c89865d430e2d106696695064ccd50bb88489.
Revert "Fix settings display on macs"

This reverts commit dca8f922a25e2ddd881ed0666f9cd9b3925c28e2.
Fix settings display on macs

My analysis for the problem in 96ecd539de8e76a880f0013b4b8854da216e17b1 was wrong.
The actual issue is that QPalette inheritance appears broken on a mac; if you set the palette to the top widget container, it doesn’t do anything on its children. However, setting the palette to the main application itself does.

Now things look exactly the same between mac and linux for better or worse. Including font sizes and colors.
A downside, is that the selection color appears to be misused in most themes including the default. So you can't tell if a text is selected or simply having focus

(cherry picked from commit 15425cb53e643a8c00975c1ef0ea7674464fdca2)
Fix old Qt setting screens preventing them from accepting keyboard inputs

Hopefully this is the final fix…
The issue seems to only have occurred on macs. When opening two MythDialogs (that includes MythPopup) in a row, often the 2nd one would not accept any used input anymore, only causing a “beep”; making it impossible to even exit that window.

The existing logic (and there was nothing wrong with it) was to simply disable the current MythDialog and put the new one on top of it. However, when doing so, somehow key events are now ignored.
So instead, we now disable all widgets within that MythDialog, without disabling the dialog itself.

When doing so, the newly created MythDialog is always working as expected.
This code should not be necessary, it is a workaround to what appears to be a Qt bug.

Fixes #11990.

(cherry picked from commit 9edb6d6c4aa0ed930be222ddd32cfc008d709d9f)