message: [Cleanup] Remove unimplemented ::GetVotes()
diff: @@ -258,7 +258,6 @@ public:
  // finds the proposal with the given name, with highest yes count.
  const CBudgetProposal* FindProposalByName(const std::string& strProposalName) const;
  CFinalizedBudget* FindFinalizedBudget(const uint256& nHash);
  - std::pair<std::string, std::string> GetVotes(std::string strProposalName);
  CAmount GetTotalBudget(int nHeight);
  std::vector<CBudgetProposal*> GetBudget();
  @@ -524,7 +523,6 @@ public:
  CBudgetProposal(std::string strProposalNameIn, std::string strURLIn, int nBlockStartIn, int nBlockEndIn, CScript addressIn, CAmount nAmountIn, uint256 nFeeTXHashIn);
  bool AddOrUpdateVote(CBudgetVote& vote, std::string& strError);
  - std::pair<std::string, std::string> GetVotes();
  UniValue GetVotesArray() const;
  void SetSynced(bool synced); // sets fSynced on votes (true only if valid)
  