DolphinQt: Allow mapping buttons to expand horizontally.

[jordan-woyak]

The removed hacks are no longer needed now that the base-class, ElidedButton, overrides sizeHint.

This fixes: https://bugs.dolphin-emu.org/issues/11707

[Miksel12]

Looks great! This gives much more room for more complex mappings with multiple inputs/operators.

[MayImilae]

Looks good. However, I'm a little concerned that this will cause some issues with translations, as this is defining horizontal space more concretely. Specifically cases like "Dead Zone", where the English name is shorter than basically any other language. But I'm not really involved in that enough to properly advise on that front.

[Miksel12]

I believe spacing is done dynamically so that shouldn't be a problem, I looked at the changes with the Dutch translation and I didn't see any alignment issues.

[MayImilae]

I'm not super familiar with our translations, but I can look at code. Looking at our Dutch translation, Dead Zone is currently translated to "Dead Zone". I don't think that counts as a valid comparison.

The worst case scenario I could fine is Arabic. "المنطقة الميتة" That is the one to test. Greek or Russian would be other ones to try.

[Miksel12]

I checked again and alignment is done dynamically, so it is aligned to the longest word in each column for each translation.

[AdmiralCurtiss]

Feels like an improvement to me.