navigator begin fixing code style

src/modules/navigator/datalinkloss.cpp

src/modules/navigator/enginefailure.cpp

src/modules/navigator/follow_target.cpp

src/modules/navigator/follow_target.h

src/modules/navigator/gpsfailure.cpp

src/modules/navigator/land.cpp

src/modules/navigator/land.h

src/modules/navigator/loiter.cpp

src/modules/navigator/rcloss.cpp

src/modules/navigator/rtl.cpp