Fixed: Upon changing the custom resolution height in the control pane…

…l, the label shown on the "Change to" button would indicate the color depth had changed to 16bit.

doomsday/engine/portable/src/ui_main.c

@@ -1141,7 +1141,7 @@ int UIEdit_Responder(ui_object_t *ob, ddevent_t *ev)
 
         case DDKEY_RETURN:
             // Store changes.
-            memset(dat->ptr, 0, dat->maxlen + 1);
+            memset(dat->ptr, 0, dat->maxlen);
             strncpy(dat->ptr, ob->text, dat->maxlen);
             if(ob->action)
                 ob->action(ob);