fix(json-abi): accept nameless `Param`s #1541

Job	Run time
feature-checks	2m 53s
miri --no-default-features	2m 36s
test stable --no-default-features	53s
miri	2m 47s
wasm	23s
test stable	48s
miri --all-features	3m 48s
test stable --all-features	1m 11s
clippy	37s
test beta --no-default-features	48s
docs	25s
test beta	46s
fmt	17s
test beta --all-features	1m 7s
test nightly --no-default-features	52s
test nightly	54s
test nightly --all-features	1m 21s
test 1.65 --no-default-features	30s
test 1.65	37s
test 1.65 --all-features	1m 0s
	24m 33s

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