rename FWPositionController to FWModeManager

Signed-off-by: Silvan <silvan@auterion.com>

posix-configs/SITL/init/test/test_shutdown

@@ -29,7 +29,7 @@ flight_mode_manager start
 mc_pos_control start vtol
 mc_att_control start vtol
 mc_rate_control start vtol
-fw_pos_control start
+fw_mode_manager start
 fw_lat_lon_control start
 fw_att_control start vtol
 airspeed_selector start
@@ -60,7 +60,7 @@ flight_mode_manager status
 mc_pos_control status
 mc_att_control status
 mc_rate_control status
-fw_pos_control status
+fw_mode_manager status
 fw_att_control status
 airspeed_selector status
 dataman status
@@ -75,7 +75,7 @@ mc_att_control stop
 fw_att_control stop
 flight_mode_manager stop
 mc_pos_control stop
-fw_pos_control stop
+fw_mode_manager stop
 navigator stop
 commander stop
 land_detector stop