message: Only use dataDir in CEvoDB when not in-memory
diff: CEvoDB* evoDb;
  CEvoDB::CEvoDB(size_t nCacheSize, bool fMemory, bool fWipe) :
  - db(GetDataDir() / "evodb", nCacheSize, fMemory, fWipe),
  + db(fMemory ? "" : (GetDataDir() / "evodb"), nCacheSize, fMemory, fWipe),
  dbTransaction(db)
  {
  }
  