Drop implicit minimum sizing from PC2 and PC3 Buttons
For the following reasons:
- It can break and look bad on Plasma Mobile which uses the Plasma style
- It makes buttons with icons and short text look visually unbalanced
- QStyle and QML desktop style buttons do not do this so it's a source of inconsistency
Tests are adjusted to all pass. Stuff looks better to my eye.
Sample before:
...and after:
