Fix compile error with MAX_MESSAGE_LENGTH

Fix #9988

Marlin/src/lcd/ultralcd.cpp

         lcd_status_message_level;    // Higher level blocks lower level
 
 #if ENABLED(STATUS_MESSAGE_SCROLLING)
-  #define MAX_MESSAGE_LENGTH max(CHARSIZE * 2 * (LCD_WIDTH), LONG_FILENAME_LENGTH)
+  #if LONG_FILENAME_LENGTH > CHARSIZE * 2 * (LCD_WIDTH)
+    #define MAX_MESSAGE_LENGTH LONG_FILENAME_LENGTH
+  #else
+    #define MAX_MESSAGE_LENGTH CHARSIZE * 2 * (LCD_WIDTH)
+  #endif
   uint8_t status_scroll_pos = 0;
 #else
   #define MAX_MESSAGE_LENGTH CHARSIZE * (LCD_WIDTH)