ResultDelegate: Fix action buttons fully expanding on height

This is a problem for multiline results where the result height can be indefinitely long.

This will change also the size of actions for single-line items. An exception could be made but at the cost of complicating the code if only a bit. The icon size is the same in all the cases (small-medium: 22px), just the click area of the button changes. I'm also writing this in case someone considers it's worth to keep that case like it was before.

BEFORE	AFTER