Genericize OpenBSD fingerprint with bad # character

d33tah noticed that the # in "Fingerprint OpenBSD 5.0 GENERIC#43 i386"
was being interpreted as a comment, resulting in matches for "OpenBSD
5.0 GENERIC". Looking at this, it appears that no other OS fingerprints
put the build number in the Fingerprint line, and this fingerprint
closely matches another OpenBSD 5.0 fingerprint. Changed to drop
everything after GENERIC.