Revert XactLockTableWait context setup in conditional multixact wait

There's no point in setting up a context error callback when doing
conditional lock acquisition, because we never actually wait and so the
user wouldn't be able to see the context message anywhere.  In fact,
this is more in line with what ConditionalXactLockTableWait is doing.

Backpatch to 9.4, where this was added.

src/backend/access/heap/heapam.c

@@ -109,8 +109,7 @@ static void MultiXactIdWait(MultiXactId multi, MultiXactStatus status, uint16 in
 				Relation rel, ItemPointer ctid, XLTW_Oper oper,
 				int *remaining);
 static bool ConditionalMultiXactIdWait(MultiXactId multi, MultiXactStatus status,
-						   uint16 infomask, Relation rel, ItemPointer ctid,
+						   uint16 infomask, Relation rel, int *remaining);
-						   XLTW_Oper oper, int *remaining);
 static XLogRecPtr log_heap_new_cid(Relation relation, HeapTuple tup);
 static HeapTuple ExtractReplicaIdentity(Relation rel, HeapTuple tup, bool key_modified,
 					   bool *copy);
@@ -4438,8 +4437,7 @@ l3:
 				{
 					if (!ConditionalMultiXactIdWait((MultiXactId) xwait,
 												  status, infomask, relation,
-													&tuple->t_data->t_ctid,
+													NULL))
-													XLTW_Lock, NULL))
 						ereport(ERROR,
 								(errcode(ERRCODE_LOCK_NOT_AVAILABLE),
 								 errmsg("could not obtain lock on row in relation \"%s\"",
@@ -6246,11 +6244,10 @@ MultiXactIdWait(MultiXactId multi, MultiXactStatus status, uint16 infomask,
  */
 static bool
 ConditionalMultiXactIdWait(MultiXactId multi, MultiXactStatus status,
-						   uint16 infomask, Relation rel, ItemPointer ctid,
+						   uint16 infomask, Relation rel, int *remaining)
-						   XLTW_Oper oper, int *remaining)
 {
 	return Do_MultiXactIdWait(multi, status, infomask, true,
-							  rel, ctid, oper, remaining);
+							  rel, NULL, XLTW_None, remaining);
 }
 
 /*