Bugfix + simplify special case for genesis
make bitcoinrpc.cpp UTF-8 conformant again

- just replaces a character in a comment, which I had problems with when
  opening the file in Qt Creator IDE
Merge pull request #2194 from Diapolo/UTF8-bitcoinrpc.cpp

make bitcoinrpc.cpp UTF-8 conformant again
Merge pull request #2190 from sipa/fixgenesis

Bugfix + simplify special case for genesis