fix(services/webdav): remove base_dir component #123

Job	Run time
build_all_features	5m 9s
build_all_platforms (ubuntu-latest)	2m 34s
build_all_platforms (macos-latest)	4m 0s
build_all_platforms (windows-latest)	4m 28s
build_default_features (ubuntu-latest)	1m 19s
build_default_features (macos-latest)	2m 37s
build_under_wasm	50s
build_default_features (windows-latest)	3m 25s
check_clippy	4m 12s
check_docs	3m 37s
check_msrv	3m 46s
unit	3m 20s
	39m 17s

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