Remove script.dontrunnextframe kludge

Now that the game loop order is fixed, this kludge (on top of kludge) is
no longer needed, and can be safely removed.

desktop_version/src/Script.h

@@ -54,7 +54,7 @@ public:
     int looppoint, loopcount;
 
     int scriptdelay;
-    bool running, dontrunnextframe;
+    bool running;
 
     //Textbox stuff
     int textx;