Updating default mapping to match changes

Added abs_deadzone, btn_throttle, and btn_rudder

mappings/default.conf

@@ -2,6 +2,7 @@ abs_x = 0
 abs_y = 1
 abs_rx = 3
 abs_ry = 4
+abs_deadzone = 0
 
 #Unused in default configuration
 #abs_dpad_y = -1
@@ -9,6 +10,8 @@ abs_ry = 4
 
 abs_throttle = 6
 abs_rudder = 7
+btn_throttle = 312
+btn_rudder = 313
 
 reverse_x = false
 reverse_y = false