sound: fix form_factor for pipewire #784

Job	Run time
pre-commit (check-toml)	1m 4s
pre-commit (check-yaml)	53s
pre-commit (check-merge-conflict)	58s
pre-commit (check-case-conflict)	59s
pre-commit (detect-private-key)	58s
pre-commit (mixed-line-ending)	54s
pre-commit (trailing-whitespace)	1m 0s
pre-commit (cspell)	1m 28s
pre-commit (typos)	1m 18s
pre-commit (cargo-fmt)	1m 4s
pre-commit (cargo-clippy)	2m 25s
pre-commit (cargo-test)	2m 33s
pre-commit (verify_icon_files)	1m 14s
	16m 48s

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