Update LCD timing on Formbot T-Rex 2+ machines

The code is slightly more optimized than it used to be and this has caused the setup and hold times on the Formbot T-Rex 2+ machines to be insufficient.   This change gives sufficient margin and the LCD Display is clean again.

Marlin/src/pins/ramps/pins_FORMBOT_TREX2PLUS.h

@@ -22,6 +22,15 @@
 #pragma once
 
 /**
+ * Override default LCD timing for Formbot T-Rex 2+ machines.
+ * The long LCD cables and the routing near electrically noisy stepper motors
+ * requires a slightly longer setup and hold time on the signals.
+ */
+#define BOARD_ST7920_DELAY_1 DELAY_NS(200)
+#define BOARD_ST7920_DELAY_2 DELAY_NS(200)
+#define BOARD_ST7920_DELAY_3 DELAY_NS(200)
+
+/**
  * Formbot pin assignments
  */