Reset getdir_click when exiting therecmdmenu early

This was causing a really annoying to track down bug where
the fuzzer threw the attached iron ball and it could end up
anywhere on the level, emitting a sanity check error.

src/cmd.c

@@ -5604,6 +5604,7 @@ dotherecmdmenu(void)
         else
             ch = there_cmd_menu(x, y, iflags.getdir_click);
         gc.clicklook_cc.x = gc.clicklook_cc.y = -1;
+        iflags.getdir_click = 0;
         return (ch && ch != '\033') ? ECMD_TIME : ECMD_OK;
     }