Dannenberg's v3ident needs to change

Hi Nick. On #17668 I mentioned that Dannenberg's v3ident has changed and this needs to be updated in config.c. Trivial change, but this should be corrected soonish since due to it Dannenberg isn't taking part in the consensus...

from stem.descriptor import DocumentHandler
from stem.descriptor.remote import DescriptorDownloader

downloader = DescriptorDownloader()

print("Consensus is signed by...\n")

query = downloader.get_consensus(document_handler = DocumentHandler.BARE_DOCUMENT)

for authority in query.run()[0].directory_authorities:
  print(' * %s with the v3ident of %s' % (authority.nickname, authority.v3ident))

% python scrap.py 
Consensus is signed by...

 * tor26 with the v3ident of 14C131DFC5C6F93646BE72FA1401C02A8DF2E8B4
 * longclaw with the v3ident of 23D15D965BC35114467363C165C4F724B64B4F66
 * maatuska with the v3ident of 49015F787433103580E3B66A1707A00E60F2D15B
 * urras with the v3ident of 80550987E1D626E3EBA5E5E75A458DE0626D088C
 * moria1 with the v3ident of D586D18309DED4CD6D57C18FDB97EFA96D330566
 * dizum with the v3ident of E8A9C45EDE6D711294FADF8E7951F4DE6CA56B58
 * gabelmoo with the v3ident of ED03BB616EB2F60BEC80151114BB25CEF515B226
 * Faravahar with the v3ident of EFCBE720AB3A82B99F9E953CD5BF50F7EEFC7B97

Again, trivial change. Andreas sent a signed email to dir-auth@ on November 18...

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Hello.

The new v3ident for dannenberg is
'0232AF901C31A04EE9848595AF9BB7620D4C5B2E'.

Best
  Andreas
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