Save LCD_CLICKED before it is cleared

The SD card menu was refreshing so slowly that the button interrupt was clearing LCD_CLICKED before the menu items could check it.

Marlin/ultralcd.cpp

     if (encoderPosition > 0x8000) encoderPosition = 0; \
     if (encoderPosition / ENCODER_STEPS_PER_MENU_ITEM < currentMenuViewOffset) currentMenuViewOffset = encoderPosition / ENCODER_STEPS_PER_MENU_ITEM;\
     uint8_t _lineNr = currentMenuViewOffset, _menuItemNr; \
+    bool wasClicked = LCD_CLICKED;\
     for(uint8_t _drawLineNr = 0; _drawLineNr < LCD_HEIGHT; _drawLineNr++, _lineNr++) { \
         _menuItemNr = 0;
 #define MENU_ITEM(type, label, args...) do { \
                 lcd_implementation_drawmenu_ ## type (_drawLineNr, _label_pstr , ## args ); \
             }\
         }\
-        if (LCD_CLICKED && (encoderPosition / ENCODER_STEPS_PER_MENU_ITEM) == _menuItemNr) {\
+        if (wasClicked && (encoderPosition / ENCODER_STEPS_PER_MENU_ITEM) == _menuItemNr) {\
             lcd_quick_feedback(); \
             menu_action_ ## type ( args ); \
             return;\