Fix config.ramps-v1.3.h.

Finally had to look it up myself. RAMPS users are apparently all
incapable or too stupid to write such fixes into an issue report.

From IRC:

xxx: oh, motors move now, thanks for helping
yyy: please write the changes into a github issue
xxx: will do
...
xxx: have to run now

... and these are the last words the world reads about xxx :-)
Observed three times now.

config.ramps-v1.3.h

@@ -258,31 +258,31 @@
 #define	X_DIR_PIN   					AIO1
 #define	X_MIN_PIN   					DIO3
 //#define	X_MAX_PIN   					DIO2
-//#define	X_ENABLE_PIN					DIO38
+#define X_ENABLE_PIN          DIO38
 //#define	X_INVERT_DIR
 //#define	X_INVERT_MIN
 //#define	X_INVERT_MAX
-//#define	X_INVERT_ENABLE
+#define X_INVERT_ENABLE
 
 #define	Y_STEP_PIN  					AIO6
 #define	Y_DIR_PIN   					AIO7
 #define	Y_MIN_PIN   					DIO14
 //#define	Y_MAX_PIN   					DIO15
-//#define	Y_ENABLE_PIN					AIO2
+#define Y_ENABLE_PIN          AIO2
 #define	Y_INVERT_DIR
 //#define	Y_INVERT_MIN
 //#define	Y_INVERT_MAX
-//#define	Y_INVERT_ENABLE
+#define Y_INVERT_ENABLE
 
 #define	Z_STEP_PIN  					DIO46
 #define	Z_DIR_PIN   					DIO48
 #define	Z_INVERT_DIR
 #define	Z_MIN_PIN   					DIO18
 //#define	Z_MAX_PIN   					DIO19
-//#define	Z_ENABLE_PIN					AIO8
+#define Z_ENABLE_PIN          AIO8
 //#define	Z_INVERT_MIN
 //#define	Z_INVERT_MAX
-//#define	Z_INVERT_ENABLE
+#define Z_INVERT_ENABLE
 
 #define	E_STEP_PIN  					DIO26
 #define	E_DIR_PIN   					DIO28