Make fog toggling test hex be an actual toggle

(i.e. you can set fog on/off unlimited times). Remember this tests
shadowmaster's enhancement of [modify_side] and [store_side].

data/scenario-test.cfg

@@ -209,16 +209,51 @@ Xu          ,Xu          , Qxu         , Qxu         , Ql          , Ql
     
     [event]
         name=moveto
+        first_time_only=no
         [filter]
             x=5
             y=8
             side=1
         [/filter]
-        [modify_side]
+        [store_side]
             side=1
-            fog=yes
-        [/modify_side]
-        [redraw][/redraw]
+            variable=side1_store
+        [/store_side]
+        [if]
+            [variable]
+                name=side1_store.fog
+                equals="no"
+            [/variable]
+            [then]
+                [modify_side]
+                    side=1
+                    fog=yes
+                [/modify_side]
+                [redraw][/redraw]
+                [remove_label]
+                    x,y=5,8
+                [/remove_label]
+                [label]
+                    x,y=5,8
+                    text="Torches, attack!"
+                [/label]
+            [/then]
+            [else]
+                [modify_side]
+                    side=1
+                    fog=no
+                [/modify_side]
+                [redraw][/redraw]
+                [remove_label]
+                    x,y=5,8
+                [/remove_label]
+                [label]
+                    x,y=5,8
+                    text="Let there be fog!"
+                [/label]
+            [/else]
+        [/if]
+        {CLEAR_VARIABLE side1_store}
     [/event]
 
     [event]