Change the highlighted button on each window

[martinD2014]

As described in issue 11184, the first button on each pane, widget or window gets highlighted and selected. This is the default behaviour for QPushButtons in a QDialog. By setting the autoDefault to false for the buttons, the close or cancel button in the bottom becomes the default which is then highlighted. This makes more sense than highlighting the first random button. This also makes it so that when pressing enter, the window closes instead of performing whatever functionality the first button on a window has.

[MayImilae]

Screenshots please~

[martinD2014]

For example the controller settings where "configure" is selected by default:

versus when "close" is selected:

Or when in the GameCube controller settings the "refresh" is selected by default:

versus when "close" is selected:

[jordan-woyak]

FYI, PR #7784 from a while back had a workaround that (depending on the dialog) might be cleaner than manually setting every single button in dolphin to not default.
Or alternatively maybe we should have a NonDefaultQPushButton derived class? Having to manually tell every button not to be the default is unfortunate.

[martinD2014]

Okay, I will look into that, thank you. Should I in the meantime set this pull request to draft?

[martinD2014]

So I made the NonDefaultQPushButton which sets the autoDefault option to false. This way it is no longer needed to specify this for every QPushButton, but you can just use the NonDefaultQPushButton. For the connect calls of the button, the normal QPushButton can still be used, so there is no need to change all those occurrences in the code.

[AdmiralCurtiss]

You should probably squash those commits, but seems fine to me otherwise.