mime-node: Clean up unwrapped MIME parts correctly.
Avoid a memory leak in the notmuch command line.
gmime_multipart_encrypted_decrypt returns a GMimeObject marked by
GMime as "transfer full", so we are supposed to clean up after it.
When parsing a message, notmuch would leak one GMimeObject part per
multipart/encrypted MIME layer. We clean it up by analogy with
cleaning up the signature list associated with a MIME node.
Signed-off-by: Daniel Kahn Gillmor <dkg@fifthhorseman.net>