Fix `Cursor::previous_logical_word` #695

Job	Run time
cargo clippy (windows-latest)	2m 15s
cargo clippy (macos-latest)	49s
cargo clippy (android) (armv7-linux-androideabi)	58s
cargo check (msrv) (android) (armv7-linux-androideabi)	47s
cargo clippy (ubuntu-latest)	1m 7s
cargo clippy (android) (aarch64-linux-android)	1m 47s
cargo check (msrv) (android) (aarch64-linux-android)	24s
cargo check (msrv) (windows-latest)	1m 4s
cargo clippy (android) (x86_64-linux-android)	1m 47s
cargo check (msrv) (android) (x86_64-linux-android)	41s
cargo doc (windows-latest)	1m 3s
cargo check (msrv) (macos-latest)	31s
cargo doc (macos-latest)	23s
formatting	25s
cargo doc (ubuntu-latest)	20s
cargo check (msrv) (ubuntu-latest)	24s
cargo test (windows-latest)	1m 10s
typos	6s
cargo test (macos-latest)	36s
cargo test (ubuntu-latest)	35s
	17m 12s

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