Some RADDS pin updates

Marlin/src/pins/pins_RADDS.h

 #define Z_MAX_PIN          38
 
 //
+// Z Probe (when not Z_MIN_PIN)
+//
+#ifndef Z_MIN_PROBE_PIN
+  #define Z_MIN_PROBE_PIN  38
+#endif
+
+//
 // Steppers
 //
 #define X_STEP_PIN         24
 
 // SPI for Max6675 or Max31855 Thermocouple
 #if DISABLED(SDSUPPORT)
-  #define MAX6675_SS        53
+  #define MAX6675_SS       53
 #else
-  #define MAX6675_SS        49
+  #define MAX6675_SS       49
 #endif
 
 //
 // Misc. Functions
 //
 #define SDSS                4
-#define PS_ON_PIN          40
+#define PS_ON_PIN          40   // SERVO3_PIN
+
+#ifndef FIL_RUNOUT_PIN
+  #define FIL_RUNOUT_PIN   39   // SERVO2_PIN
+#endif
 
 // I2C EEPROM with 8K of space
 #define I2C_EEPROM