MK2.5: fix swapped yes/no messaged for Z manual alignment

Firmware/ultralcd.cpp

@@ -3009,7 +3009,7 @@ bool lcd_calibrate_z_end_stop_manual(bool only_z)
         uint8_t result = lcd_show_fullscreen_message_yes_no_and_wait_P(_i("Are left and right Z~carriages all up?"), false);////MSG_CONFIRM_CARRIAGE_AT_THE_TOP c=20 r=2
         if (result == LCD_BUTTON_TIMEOUT)
             goto canceled;
-        else if (result == LCD_MIDDLE_BUTTON_CHOICE)
+        else if (result == LCD_LEFT_BUTTON_CHOICE)
             goto calibrated;
         // otherwise perform another round of the Z up dialog.
     }