chore: remove clone for context in handler_register.rs #2773

Job	Run time
check no-default-features	15s
check serde	17s
check std	22s
clippy	1m 11s
docs	1m 13s
fmt	6s
test stable --no-default-features	59s
test no_std	17s
test stable	44s
test stable --all-features	1m 8s
test beta --no-default-features	47s
test beta	49s
test beta --all-features	1m 6s
test nightly --no-default-features	56s
test nightly	47s
test nightly --all-features	1m 5s
	12m 2s

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