Makefile: fix mavsdk_tests invocation

The config file was missing and a speed factor of 20 is much more
realistic.

Makefile

@@ -370,14 +370,14 @@ rostest: px4_sitl_default
 tests_integration: px4_sitl_default
 	@$(MAKE) --no-print-directory px4_sitl_default sitl_gazebo
 	@$(MAKE) --no-print-directory px4_sitl_default mavsdk_tests
-	@"$(SRC_DIR)"/test/mavsdk_tests/mavsdk_test_runner.py --speed-factor 100
+	@"$(SRC_DIR)"/test/mavsdk_tests/mavsdk_test_runner.py --speed-factor 20 test/mavsdk_tests/configs/sitl.json
 
 tests_integration_coverage:
 	@$(MAKE) clean
 	@$(MAKE) --no-print-directory px4_sitl_default PX4_CMAKE_BUILD_TYPE=Coverage
 	@$(MAKE) --no-print-directory px4_sitl_default sitl_gazebo
 	@$(MAKE) --no-print-directory px4_sitl_default mavsdk_tests
-	@"$(SRC_DIR)"/test/mavsdk_tests/mavsdk_test_runner.py --speed-factor 100
+	@"$(SRC_DIR)"/test/mavsdk_tests/mavsdk_test_runner.py --speed-factor 20 test/mavsdk_tests/configs/sitl.json
 	@mkdir -p coverage
 	@lcov --directory build/px4_sitl_default --base-directory build/px4_sitl_default --gcov-tool gcov --capture -o coverage/lcov.info