Turn TryCreateDirectory() into TryCreateDirectories()

Use case: TryCreateDirectory(GetDataDir() / "blocks" / "index") would
fail if the blocks directory was not explicitly created before.

The line that did so was in a weird location and could be removed as a
result.

src/dbwrapper.cpp

@@ -108,7 +108,7 @@ CDBWrapper::CDBWrapper(const fs::path& path, size_t nCacheSize, bool fMemory, bo
             leveldb::Status result = leveldb::DestroyDB(path.string(), options);
             dbwrapper_private::HandleError(result);
         }
-        TryCreateDirectory(path);
+        TryCreateDirectories(path);
         LogPrintf("Opening LevelDB in %s\n", path.string());
     }
     leveldb::Status status = leveldb::DB::Open(options, path.string(), &pdb);