Fix EZBoard platform test

Marlin/src/pins/lpc1769/pins_TH3D_EZBOARD.h

@@ -25,7 +25,7 @@
  * TH3D EZBoard pin assignments
  */
 
-#ifndef TARGET_LPC1769
+#ifndef LPC1769
   #error "Oops! Make sure you have the LPC1769 environment selected in your IDE."
 #endif