pico_svg: Simplify color parsing. #1835

Job	Run time
cargo check (msrv) (wasm32)	49s
cargo check (msrv) (windows-latest)	1m 19s
cargo check (aarch64-android)	21s
cargo clippy (windows-latest)	2m 32s
cargo check (msrv) (macos-latest)	39s
cargo clippy (macos-latest)	1m 22s
cargo clippy (wasm32)	1m 30s
cargo clippy (ubuntu-latest)	1m 32s
cargo doc	1m 46s
cargo check (msrv) (ubuntu-latest)	48s
formatting	23s
Prime LFS Cache	4s
cargo test (wasm32)	28s
typos	5s
cargo test (windows-latest)	1m 49s
cargo test (macos-latest)	2m 3s
cargo test (ubuntu-latest)	3m 0s
	20m 30s

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