Fix T83991: Pasting sound strip not working correctly

New UUID was generated for original strip not new one.

Bug caused "invisible" sound strip playing that is impossible to
remove. Especially noticable when transforming pasted strips. In such
case, file reload was necessary.

Reviewed By: mont29

Differential Revision: https://developer.blender.org/D9912

source/blender/sequencer/intern/sequencer.c

@@ -361,7 +361,7 @@ static Sequence *seq_dupli(const Scene *scene_src,
   Sequence *seqn = MEM_dupallocN(seq);
 
   if ((flag & LIB_ID_CREATE_NO_MAIN) == 0) {
-    SEQ_relations_session_uuid_generate(seq);
+    SEQ_relations_session_uuid_generate(seqn);
   }
 
   seq->tmp = seqn;