🩹 Adjust GTR 1.0 ST7920 display delay (#22904)

Marlin/src/pins/stm32f4/pins_BTT_GTR_V1_0.h

 
   // Alter timing for graphical display
   #if IS_U8GLIB_ST7920
-    #define BOARD_ST7920_DELAY_1              96
-    #define BOARD_ST7920_DELAY_2              48
+    #define BOARD_ST7920_DELAY_1             125
+    #define BOARD_ST7920_DELAY_2              90
     #define BOARD_ST7920_DELAY_3             600
   #endif