Update pins for GT2560_Rev_A_Plus

For PR #7738

Marlin/src/pins/pins_GT2560_REV_A_PLUS.h

 #undef BOARD_NAME
 #define BOARD_NAME  "GT2560 Rev.A+"
 
-#define SERVO0_PIN  11
+#if ENABLED(BLTOUCH)
+  #define SERVO0_PIN  32
+#else
+  #define SERVO0_PIN  11
+#endif