validation: Move flush filter stop validation

This gets rid of a cyclic dependency in the specification graph.

Update #3716.

testsuites/validation/tc-sem-flush.c

@@ -407,7 +407,7 @@ static void RtemsSemReqFlush_Post_Action_Check(
        * The calling task shall flush the semaphore as specified by
        * /score/tq/req/flush-fifo.
        */
-      ScoreTqReqFlushFifo_Run( &ctx->tq_ctx );
+      ScoreTqReqFlushFifo_Run( &ctx->tq_ctx, false );
       break;
     }