AP_GPS: do not zero options after assigning from location

On the assumption that the assignment operator knows what it is doing,
and that we have no idea what fields are actually present in options

libraries/AP_GPS/AP_GPS.cpp

@@ -819,7 +819,6 @@ void AP_GPS::setHIL(uint8_t instance, GPS_Status _status, uint64_t time_epoch_ms
     GPS_State &istate = state[instance];
     istate.status = _status;
     istate.location = _location;
-    istate.location.options = 0;
     istate.velocity = _velocity;
     istate.ground_speed = norm(istate.velocity.x, istate.velocity.y);
     istate.ground_course = wrap_360(degrees(atan2f(istate.velocity.y, istate.velocity.x)));

libraries/AP_GPS/AP_GPS_MAV.cpp

@@ -67,7 +67,6 @@ void AP_GPS_MAV::handle_msg(const mavlink_message_t *msg)
                 loc.alt = packet.alt * 100; // convert to centimeters
             }
             state.location = loc;
-            state.location.options = 0;
 
             if (have_hdop) {
                 state.hdop = packet.hdop * 100; // convert to centimeters
@@ -123,7 +122,6 @@ void AP_GPS_MAV::handle_msg(const mavlink_message_t *msg)
             loc.lng = packet.lon;
             loc.alt = packet.alt * 0.1f;
             state.location = loc;
-            state.location.options = 0;
             state.hdop = MIN(packet.eph, GPS_UNKNOWN_DOP);
             state.vdop = MIN(packet.epv, GPS_UNKNOWN_DOP);
             if (packet.vel < 65535) {

libraries/AP_GPS/AP_GPS_UAVCAN.cpp

@@ -186,7 +186,6 @@ void AP_GPS_UAVCAN::handle_fix_msg(const FixCb &cb)
         loc.lng = cb.msg->longitude_deg_1e8 / 10;
         loc.alt = cb.msg->height_msl_mm / 10;
         interim_state.location = loc;
-        interim_state.location.options = 0;
 
         if (!uavcan::isNaN(cb.msg->ned_velocity[0])) {
             Vector3f vel(cb.msg->ned_velocity[0], cb.msg->ned_velocity[1], cb.msg->ned_velocity[2]);