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Distinguish MOVE_UNUSED from MOVE_NO_EFFECT in Unruly

--- a/unruly.c

+++ b/unruly.c

@@ -1628,7 +1628,7 @@

                 nullret = MOVE_UI_UPDATE;

             }

         } else

-            return NULL;

+            return MOVE_UNUSED;

     }

     /* Keyboard move */

@@ -1672,7 +1672,7 @@

         return dupstr(buf);

     }

-    return NULL;

+    return MOVE_UNUSED;

 }

 static game_state *execute_move(const game_state *state, const char *move)