message: reword exception message on immutable realm file not found
diff: @@ -455,8 +455,10 @@ REALM_NOINLINE void translate_file_exception(StringData path, bool immutable)
  util::format("File at path '%1' already exists.", ex.get_path()), ex.what());
  }
  catch (util::File::NotFound const& ex) {
  - throw RealmFileException(RealmFileException::Kind::NotFound, ex.get_path(),
  - util::format("Directory at path '%1' does not exist.", ex.get_path()), ex.what());
  + throw RealmFileException(
  + RealmFileException::Kind::NotFound, ex.get_path(),
  + util::format("'%1' at path '%2' does not exist.", immutable ? "File" : "Directory", ex.get_path()),
  + ex.what());
  }
  catch (FileFormatUpgradeRequired const& ex) {
  throw RealmFileException(RealmFileException::Kind::FormatUpgradeRequired, path,
  