Merge branch 'fix-revert-scroll' into 'master'

Fix scroll bars shown in Revert dialogue box


## What does this MR do?

Eliminate scroll bars shown in Revert dialogue box, see the screenshots.

## Are there points in the code the reviewer needs to double check?

N/A

## Why was this MR needed?

Ugly scroll bars are shown in Revert dialogue box.

## What are the relevant issue numbers?

N/A

## Screenshots

![Screen_Shot_2016-04-05_at_15.27.10](/uploads/428295858ada7cd2fcdf1e831c42f8ec/Screen_Shot_2016-04-05_at_15.27.10.png)



See merge request !3532

app/assets/stylesheets/pages/help.scss

@@ -59,6 +59,9 @@
   position: relative;
   overflow-y: auto;
   padding: 15px;
+  .form-actions {
+    margin: -$gl-padding+1;
+  }
 }
 body.modal-open {