fix: remove flag gc_no_space from SR sm-config

The message OpaqueRef in the SR sm-config was not removed, causing to
try to remove it multiple time and failing.

Signed-off-by: Damien Thenot <damien.thenot@vates.tech>

Author: Nambrok

libs/sm/cleanup.py

@@ -1620,6 +1620,7 @@ def check_no_space_candidates(self):
                 candidate.setConfig(VDI.DB_GC_NO_SPACE, msg_id)
         elif msg_id is not None:
             # Everything was coalescable, remove the message
+            xapi_session.xenapi.SR.remove_from_sm_config(self.xapi.srRef, VDI.DB_GC_NO_SPACE)
             xapi_session.xenapi.message.destroy(msg_id)
 
     def clear_no_space_msg(self, vdi):