Patch for keybox search with ED448 subkeys of v4 key

[Kyle Butt]

I hit a bug at head recently because I had generated some ED448 subkeys
of one of my keys. Looking up the public key block of the key id fails.
It fails because the ED448 key has a 32 bit fingerprint and uses the
first 64 bits as a long fingerprint. The lookup doesn't take this into
account, because it assumes the same length of fingerprint for all
subkeys beneath a key.

I've attached a patch that corrects the behavior when searching the
keybox.
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