webadmin: re-order gluster hook conflict actions

When a hook has both content and missing conflicts
if the user selects 'Remove' to resolve a missing
conflict then the content conflict actions should be disabled.

Also moved the missing conflict to the top.

Change-Id: Ic7d425f79b0c0c22605b2343e892851de33f16e9
Bug-Url: https://bugzilla.redhat.com/975795
Signed-off-by: Kanagaraj M <kmayilsa@redhat.com>