gapselect Question type requires alignment adjustment

[sali]

The alignment is very 'spaced out' and a little misaligned for the "Select missing word" (gapselect) question type. The drop-down for the Group is also quite large as shown:

This is how it appears in the Clean theme:

[Info 3bits]

Fix #308

→ <<cset 8d53a1a7d8b1>>