Navigator: land: fix when flying without global position estimate #26251

Job	Run time
build (check_format)	1m 5s
build (check_newlines)	1m 34s
build (tests)	5m 43s
build (tests_coverage)	7m 16s
build (px4_fmu-v2_default stack_check)	3m 10s
build (validate_module_configs)	55s
build (shellcheck_all)	1m 26s
build (NO_NINJA_BUILD=1 px4_fmu-v5_default)	4m 9s
build (NO_NINJA_BUILD=1 px4_sitl_default)	3m 23s
build (px4_sitl_allyes)	4m 21s
build (airframe_metadata)	57s
build (module_documentation)	59s
build (parameters_metadata)	1m 5s
	36m 3s

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