Fix for button sizes

The CSS avoids using explicit height to make sure that the buttons can
grow when the text inside becomes longer in some languages (where it
may need an addiional line).

The selector rule has been modified to make sure that min-height was
not overriden by the one defined at .column class.

Bug: 54477
Change-Id: I7afb9fa1ad006685cd9946a632312645b75c7066
Merge "Fix for button sizes"