core: fix distance_range_map.to_range_map #10925

Job	Run time
check_commits	8s
check_infra_schema_sync	19s
build (core-build, core)	2m 29s
check_generated_railjson_sync	19s
build (editoast, editoast-test)	31s
build (gateway-test, gateway-standalone, gateway-front)	1m 33s
check_integration_tests	1m 21s
check_osrd_schema	38s
build (front-build, front-tests, front-devel, front-nginx)	18s
check_railjson_generator	1m 52s
build (osrdyne, osrdyne-test)	16s
check_reuse_compliance	12s
check_toml	8s
Check final newline	7s
check_editoast_tests	4m 25s
check_front_rtk_sync	1m 40s
check_core	4m 1s
check_editoast_lints	5m 6s
check_editoast_openapi	1m 12s
check_front	2m 52s
check_gateway	2m 9s
check_osrdyne	2m 37s
integration_tests	9m 38s
	43m 51s

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