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Distinguish MOVE_UNUSED from MOVE_NO_EFFECT in Flood

Clicking outside the grid hides the keyboard cursor, so it's not
MOVE_UNUSED like it usually is.

--- a/flood.c

+++ b/flood.c

@@ -845,7 +845,7 @@

                state->soln && state->solnpos < state->soln->nmoves) {

 	move = state->soln->moves[state->solnpos];

     } else {

-        return NULL;

+        return MOVE_UNUSED;

     }

     if (tx >= 0 && tx < w && ty >= 0 && ty < h &&

@@ -858,7 +858,7 @@

         return dupstr(buf);

     }

-    return NULL;

+    return MOVE_NO_EFFECT;

 }

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