Fix MAX_MESSAGE_LENGTH

Marlin/src/lcd/ultralcd.cpp

   #if ENABLED(SDSUPPORT)
     #include "../sd/cardreader.h"
   #endif
+
   #if ENABLED(EXTENSIBLE_UI)
     #define START_OF_UTF8_CHAR(C) (((C) & 0xC0u) != 0x80u)
   #endif
-
-  #define MAX_MESSAGE_LENGTH 63
-  uint8_t MarlinUI::status_message_level; // = 0
-  char MarlinUI::status_message[MAX_MESSAGE_LENGTH + 1];
 #endif
 
 #if HAS_SPI_LCD
   #else
     #define MAX_MESSAGE_LENGTH CHARSIZE * 2 * (LCD_WIDTH)
   #endif
+#elif ENABLED(EXTENSIBLE_UI)
+  #define MAX_MESSAGE_LENGTH 63
 #else
   #define MAX_MESSAGE_LENGTH CHARSIZE * (LCD_WIDTH)
 #endif
 
+#if HAS_SPI_LCD || ENABLED(EXTENSIBLE_UI)
+  uint8_t MarlinUI::status_message_level; // = 0
+  char MarlinUI::status_message[MAX_MESSAGE_LENGTH + 1];
+#endif
+
 #if HAS_LCD_MENU && LCD_TIMEOUT_TO_STATUS
   bool MarlinUI::defer_return_to_status;
 #endif