Fix broken pg_dump code for dumping comments on event triggers.

This never worked, I think.  Per report from Marc Munro.

In passing, fix funny spacing in the COMMENT ON command as a result of
excess space in the "label" string.

src/bin/pg_dump/pg_dump.c

@@ -14778,7 +14778,7 @@ dumpEventTrigger(Archive *fout, EventTriggerInfo *evtinfo)
 				 query->data, "", NULL, NULL, 0, NULL, NULL);
 
 	dumpComment(fout, labelq->data,
-				NULL, NULL,
+				NULL, evtinfo->evtowner,
 				evtinfo->dobj.catId, 0, evtinfo->dobj.dumpId);
 
 	destroyPQExpBuffer(query);