[8138] - See http://tracker.modx.com/issues/8138
Make sure system settings using combo boxes are properly save when edited in a window (right click > update)
[#8138] add changelog entry
[#8138] Fix Combo Settings not saving from update dialog

Merge branch 'bug-8138' into release-2.2

* bug-8138:
  [#8138] add changelog entry
  [8138] - See http://tracker.modx.com/issues/8138 Make sure system settings using combo boxes are properly save when edited in a window (right click > update)