This increases the height StoneButtons and TabButtons, so that a
double-spaced caption does fit on them without significant overflow.
Exempt from that are the StoneButtons resembling lists in the main menu
and the in-game menu, as changing their height didn't feel right and we
don't need double-spaced captions for them anyway, as they're wide
enough.
The height of StoneButtons got increased from 28px to 32px, while the
height of TabButtons got increased from 30px to 34px.