fix visibility for `pallet_nfts` types used as call arguments #5953

Job	Run time
check-dependency-rules	8s
check-markdown	15s
check-workspace	18s
set-image	9s
check-rust-feature-propagation	1m 51s
check-toml-format	55s
check-umbrella	2m 8s
fmt	1m 6s
test-rust-features	1m 51s
	8m 41s

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