Special override of LCD_WIDTH

Marlin/src/config/examples/Geeetech/GT2560/Configuration.h

@@ -1837,7 +1837,7 @@
 #if ENABLED(ULTIMAKERCONTROLLER) || ENABLED(REPRAP_DISCOUNT_SMART_CONTROLLER) || ENABLED(G3D_PANEL) || ENABLED(MKS_MINI_12864)
   #define SDSUPPORT   // Force SD Card support on for these displays
 #elif ENABLED(ULTRA_LCD) && ENABLED(DOGLCD) // No panel, just graphical LCD?
-  #define LCD_WIDTH 20 // Default is 22. For this Geeetech use 20
+  #define LCD_WIDTH_OVERRIDE 20 // Default is 22. For this Geeetech use 20
 #endif
 
 #endif // CONFIGURATION_H

Marlin/src/inc/Conditionals_LCD.h

@@ -287,8 +287,12 @@
 
 #if ENABLED(DOGLCD) // Change number of lines to match the DOG graphic display
   #ifndef LCD_WIDTH
+    #ifdef LCD_WIDTH_OVERRIDE
+      #define LCD_WIDTH LCD_WIDTH_OVERRIDE
+    #else
       #define LCD_WIDTH 22
     #endif
+  #endif
   #ifndef LCD_HEIGHT
     #define LCD_HEIGHT 5
   #endif