Revert "Update html/tTraceTest8.js"

This reverts commit 638e39ef

html/tTraceTest8.js

-/******************** 
+/******************** 
  * Ttracetest8 Test *
  ********************/
 
@@ -1619,8 +1619,6 @@ function trialRoutineEnd(trials) {
     // the Routine "trial" was not non-slip safe, so reset the non-slip timer
     routineTimer.reset();
     
-    psychoJS.window.flip();
-
     return Scheduler.Event.NEXT;
   };
 }