Rename commander.cpp to Commander.cpp and update CMakeLists.txt.

src/modules/commander/CMakeLists.txt

@@ -42,7 +42,7 @@ px4_add_module(
 		arm_auth.cpp
 		baro_calibration.cpp
 		calibration_routines.cpp
-		commander.cpp
+		Commander.cpp
 		commander_helper.cpp
 		esc_calibration.cpp
 		gyro_calibration.cpp