fontique: Fix and un-allow `clippy::partial_pub_fields` lint #779

Job	Run time
cargo check (msrv) (android) (armv7-linux-androideabi)	22s
cargo clippy (android) (armv7-linux-androideabi)	54s
cargo clippy (windows-latest)	2m 7s
cargo check (msrv) (android) (aarch64-linux-android)	43s
cargo clippy (android) (aarch64-linux-android)	1m 42s
cargo check (msrv) (windows-latest)	1m 11s
cargo clippy (macos-latest)	1m 4s
cargo check (msrv) (android) (x86_64-linux-android)	42s
cargo clippy (android) (x86_64-linux-android)	1m 46s
cargo check (msrv) (macos-latest)	38s
cargo clippy (ubuntu-latest)	1m 5s
cargo check (msrv) (ubuntu-latest)	33s
cargo doc (windows-latest)	1m 31s
formatting	22s
cargo doc (macos-latest)	20s
cargo test (windows-latest)	1m 10s
typos	3s
cargo doc (ubuntu-latest)	20s
cargo test (macos-latest)	36s
cargo test (ubuntu-latest)	37s
	17m 46s

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