vello_editor: Use PresentMode::Mailbox when available. #424

Job	Run time
cargo clippy (android) (armv7-linux-androideabi)	1m 36s
cargo clippy (windows-latest)	2m 44s
cargo clippy (android) (aarch64-linux-android)	54s
cargo clippy (macos-latest)	1m 58s
cargo check (msrv) (windows-latest)	1m 0s
cargo check (msrv) (android) (armv7-linux-androideabi)	46s
cargo clippy (android) (x86_64-linux-android)	1m 42s
cargo clippy (ubuntu-latest)	57s
cargo check (msrv) (macos-latest)	40s
cargo check (msrv) (android) (aarch64-linux-android)	28s
cargo check (msrv) (ubuntu-latest)	21s
cargo check (msrv) (android) (x86_64-linux-android)	48s
cargo fmt	25s
cargo doc (windows-latest)	2m 3s
cargo test (windows-latest)	1m 54s
typos	3s
cargo test (macos-latest)	31s
cargo doc (macos-latest)	1m 23s
cargo test (ubuntu-latest)	27s
cargo doc (ubuntu-latest)	1m 0s
	21m 40s

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