MT#55984 cancel scheduled deletion during offer/answer

Unmark a monologue that has been scheduled for deletion when it's
associated with another one, which happens during offer/answer.

Fixes a regression from 53dbef7e1 which removed this logic from
__monologue_unkernelize with re-adding it elsewhere.

Change-Id: I037162e91fec42631680f7767f58b172fd6e04db
(cherry picked from commit afb42551c4)

daemon/call.c

@@ -4108,8 +4108,17 @@ struct call_monologue *call_get_or_create_monologue(struct call *call, const str
 	return ret;
 }
 
-/* must be called with call->master_lock held in W */
+/**
+ * Must be called with call->master_lock held in W.
+ *
+ * Also cancel scheduled deletion during offer/answer:
+ *
+ * Unmark a monologue that has been scheduled for deletion when it's
+ * associated with another one, which happens during offer/answer.
+ */
 static void __tags_associate(struct call_monologue *a, struct call_monologue *b) {
+	a->deleted = 0;
+	b->deleted = 0;
 	g_hash_table_insert(a->associated_tags, b, b);
 	g_hash_table_insert(b->associated_tags, a, a);
 }