Minor optimization of Delimiters::from_byte to avoid an extra branch. #333

Job	Run time
Linux (nightly)	2m 28s
Linux (nightly, --features dummy_match_byte)	2m 29s
Linux (beta)	31s
Linux (beta, --features dummy_match_byte)	34s
Linux (stable)	31s
Linux (stable, --features dummy_match_byte)	33s
Linux (1.63.0)	1m 11s
Linux (1.63.0, --features dummy_match_byte)	1m 10s
Linux (nightly, --features bench)	5m 45s
Linux (nightly, --features bench,dummy_match_byte)	5m 47s
Result	1s
	21m 0s

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