webadmin: glance domain - fix images tab

Glance storage domain are unattached, hence, shouldn't
be checked against Active status (change has been introduced
in change-Id Idb29eb14a07a8084b62bda5ac41769ce964bac16
to prevent query on inactive domains).

Change-Id: I5cdad6f443b19ad240b3c60c0f8f62798aca7bd8
Bug-Url: https://bugzilla.redhat.com/1161941
Signed-off-by: Daniel Erez <derez@redhat.com>