webadmin: help icon overflow

- Fixed issue where if a popup header was too long it would cause
  the help icon to overflow to the next line and look out of place.
  Re-arranged the header layout a little bit so the title text is in
  its own div that is moved on top of the title background to allow
  for flowing onto any background.

Signed-off-by: Alexander Wels <awels@redhat.com>
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1001554
Change-Id: I10abcbd977df4367584cc22529b47334c4c00d99