Don't add stopped state in diagnostic script

diagnostic_scripts/diagnosys.jme

@@ -10,7 +10,6 @@ state (Produces the initial value of the state object): // should be renamed "in
         ),
         "retries": 3,
         "finished": false,
-        "stopped": false,
     ]
 
 topics_by_objective (A dictionary mapping a learning objective name to a list of indices of topics):
@@ -62,7 +61,7 @@ action_retry (Use up one retry and visit the same topic again):
 action_stop (Stop the exam):
     [
         "label": "Finish the exam.",
-        "state": state + [ "stopped": true ],
+        "state": state,
         "next_question": nothing
     ]
 
@@ -90,15 +89,12 @@ action_move_on (Move to the next topic, or end the exam if there are no more):
 can_move_on:
     action_move_on["next_question"]<>nothing
 
-stopped:
-    state["stopped"]=true
-
 next_actions (Actions to offer to the student when they ask to move on):
     let(
         feedback, retries_feedback+"\n\nWhat would you like to do next?"
     ,   [
             "feedback": feedback,
-            "actions": if(not correct and not stopped and state["retries"]>0, [action_retry], []) + if(can_move_on,[action_move_on],[]) + if(not correct and not stopped and state["retries"] > 0 and not can_move_on and not stopped, [action_stop], [])
+            "actions": if(not correct and state["retries"]>0, [action_retry], []) + if(can_move_on,[action_move_on],[action_stop])
         ]
     )