Update display timing for SKR Pro (#21346)

Marlin/src/pins/sanguino/pins_MELZI_V2.h

     #define BOARD_ST7920_DELAY_1 DELAY_NS(0)
   #endif
   #ifndef BOARD_ST7920_DELAY_2
-    #define BOARD_ST7920_DELAY_2 DELAY_NS(188)
+    #define BOARD_ST7920_DELAY_2 DELAY_NS(400)
   #endif
   #ifndef BOARD_ST7920_DELAY_3
     #define BOARD_ST7920_DELAY_3 DELAY_NS(0)

Marlin/src/pins/stm32f4/pins_BTT_SKR_PRO_common.h

 // Alter timing for graphical display
 #if HAS_MARLINUI_U8GLIB
   #ifndef BOARD_ST7920_DELAY_1
-    #define BOARD_ST7920_DELAY_1    DELAY_NS(96)
+    #define BOARD_ST7920_DELAY_1    DELAY_NS(125)
   #endif
   #ifndef BOARD_ST7920_DELAY_2
-    #define BOARD_ST7920_DELAY_2    DELAY_NS(48)
+    #define BOARD_ST7920_DELAY_2    DELAY_NS(90)
   #endif
   #ifndef BOARD_ST7920_DELAY_3
     #define BOARD_ST7920_DELAY_3   DELAY_NS(600)