follow-me: disable SITL test

Need to update MAVSDK with the following PR:
mavlink/MAVSDK#1770

SITL is failing now because the follow-me
perspectives are no longer defined the
same way in MAVSDK and in the flight task.

test/mavsdk_tests/CMakeLists.txt

@@ -17,15 +17,17 @@ if(MAVSDK_FOUND)
         test_main.cpp
         autopilot_tester.cpp
         autopilot_tester_failure.cpp
-        autopilot_tester_follow_me.cpp
+        # follow-me needs a MAVSDK update:
+        # https://github.com/mavlink/MAVSDK/pull/1770
+        # autopilot_tester_follow_me.cpp
         test_multicopter_control_allocation.cpp
         test_multicopter_failure_injection.cpp
         test_multicopter_failsafe.cpp
         test_multicopter_mission.cpp
         test_multicopter_offboard.cpp
         test_multicopter_manual.cpp
         test_vtol_mission.cpp
-        test_multicopter_follow_me.cpp
+        # test_multicopter_follow_me.cpp
     )
 
     target_link_libraries(mavsdk_tests