Don't skip unrecognized lines in certain cases.
When we started using Java 7's switch-on-String in 2b4d7732, we broke unrecognized line parsing in extra-info descriptors. Namely, when we reached the end of a crypto block we didn't reset the list for collecting crypto lines. So far so good, but any following unrecognized lines would be collected as crypto lines and later discarded, rather than being added to the unrecognized-lines list and later reported. This only affects relay descriptors, because sanitized bridge descriptors don't contain crypto blocks. And it only affects relay descriptors with crypto blocks, like "identity-ed25519", whereas relay extra-info descriptors published by older versions were not affected. Fixes #21890.