Use the largest ascent as the ascent for a font #12759

Job	Run time
Check wasm32 + wasm-bindgen	2m 34s
Check wasm32+atomics	1m 22s
ios	21s
android	22s
Format + check + test	5m 25s
cargo-deny aarch64-apple-darwin	39s
Check Windows	1m 27s
cargo-deny aarch64-linux-android	37s
cargo-deny i686-pc-windows-gnu	37s
cargo-deny i686-pc-windows-msvc	38s
cargo-deny i686-unknown-linux-gnu	39s
cargo-deny wasm32-unknown-unknown	38s
cargo-deny x86_64-apple-darwin	37s
cargo-deny x86_64-pc-windows-gnu	36s
cargo-deny x86_64-pc-windows-msvc	39s
cargo-deny x86_64-unknown-linux-gnu	40s
cargo-deny x86_64-unknown-linux-musl	40s
cargo-deny x86_64-unknown-redox	39s
	19m 10s

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