Fix buttons with different height in merge request widget

Filipa Lacerda requested to merge 37331-button-MR-widget into master

What does this MR do?

Fixes the buttons not having the same height in the MR widget: Screen_Shot_2017-09-01_at_18.08.36

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Closes #37331 (closed)

Merge request reports