message: Remove obsolete toString from enum call
diff: @@ -339,7 +339,7 @@ export class WebTileDataSource extends DataSource {
  if (this.m_ppi !== WebTileDataSource.ppiValue.ppi72) {
  // because ppi=72 is default, we do not include it in the request
  - url += `&ppi=${this.m_ppi.toString}`;
  + url += `&ppi=${this.m_ppi}`;
  }
  if (this.m_languages !== undefined && this.m_languages[0] !== undefined) {
  url += `&lg=${this.m_languages[0]}`;
  