[Keyboard] Add missng define for 4x6 Tractyl Manuform (#15363)

keyboards/handwired/tractyl_manuform/4x6_right/config.h

@@ -89,3 +89,5 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 /* PMW3360 Settings */
 #define PMW3360_CS_PIN           B0
+
+#define POINTING_DEVICE_RIGHT