Copter: reduce ANGLE_MAX default to 30deg

ArduCopter/config.h

@@ -559,7 +559,7 @@
  # define ROLL_PITCH_YAW_INPUT_MAX      4500        // roll, pitch and yaw input range
 #endif
 #ifndef DEFAULT_ANGLE_MAX
- # define DEFAULT_ANGLE_MAX         4500            // ANGLE_MAX parameters default value
+ # define DEFAULT_ANGLE_MAX         3000            // ANGLE_MAX parameters default value
 #endif
 #ifndef ANGLE_RATE_MAX
  # define ANGLE_RATE_MAX            18000           // default maximum rotation rate in roll/pitch axis requested by angle controller used in stabilize, loiter, rtl, auto flight modes