mavsdk_tests: enable VTOL, fix TEST_CASE name

We can't use commas in the TEST_CASE name. With the comma, the test did
not run and displayed:

Filters: Takeoff, transition and RTL
No test cases matched 'Takeoff'
No test cases matched 'transition and RTL'
==========================================
No tests ran

test/mavsdk_tests/test_mission_vtol.cpp

@@ -11,7 +11,7 @@
 #include "autopilot_tester.h"
 
 
-TEST_CASE("Takeoff, transition and RTL", "[vtol]")
+TEST_CASE("Takeoff and transition and RTL", "[vtol]")
 {
     AutopilotTester tester;
     tester.connect(connection_url);