shithub: puzzles

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Fix typo in undo key handling.

Now we can undo with both 'u' and 'U', symmetrically with redoing with
both 'r' and 'R'.

--- a/midend.c

+++ b/midend.c

@@ -600,7 +600,7 @@

 	    midend_new_game(me);

 	    midend_redraw(me);

 	    goto done;		       /* never animate */

-	} else if (button == 'u' || button == 'u' ||

+	} else if (button == 'u' || button == 'U' ||

 		   button == '\x1A' || button == '\x1F') {

 	    midend_stop_anim(me);

 	    type = me->states[me->statepos-1].movetype;