Update GLCD Silvergate display timing (#17518)

Marlin/src/lcd/dogm/ultralcd_st7920_u8glib_rrd_AVR.h

@@ -46,11 +46,11 @@
   #define CPU_ST7920_DELAY_1 DELAY_NS(0)
   #define CPU_ST7920_DELAY_2 DELAY_NS(0)
   #define CPU_ST7920_DELAY_3 DELAY_NS(50)
-#elif MB(3DRAG, K8200, K8400, SILVER_GATE)
+#elif MB(3DRAG, K8200, K8400)
   #define CPU_ST7920_DELAY_1 DELAY_NS(0)
   #define CPU_ST7920_DELAY_2 DELAY_NS(188)
   #define CPU_ST7920_DELAY_3 DELAY_NS(0)
-#elif MB(MINIRAMBO, EINSY_RAMBO, EINSY_RETRO)
+#elif MB(MINIRAMBO, EINSY_RAMBO, EINSY_RETRO, SILVER_GATE)
   #define CPU_ST7920_DELAY_1 DELAY_NS(0)
   #define CPU_ST7920_DELAY_2 DELAY_NS(250)
   #define CPU_ST7920_DELAY_3 DELAY_NS(0)