battery_status.msg: remove unused fields #24347

Job	Run time
build (check_format)	1m 1s
build (tests)	5m 47s
build (tests_coverage)	7m 10s
build (px4_fmu-v2_default stack_check)	3m 17s
build (validate_module_configs)	50s
build (shellcheck_all)	1m 42s
build (NO_NINJA_BUILD=1 px4_fmu-v5_default)	4m 14s
build (NO_NINJA_BUILD=1 px4_sitl_default)	3m 18s
build (px4_sitl_allyes)	4m 17s
build (airframe_metadata)	1m 6s
build (module_documentation)	2m 57s
build (parameters_metadata)	1m 11s
	36m 50s

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