webadmin: title overlaps header icon

- For dialogs with header icons the title would overlap
  the icon. This patch fixes the overlap.

Change-Id: I398b5daf8c02734a7b0e9e9777494100ee808d12
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1057101
Signed-off-by: Alexander Wels <awels@redhat.com>