fix 漏兼容 ol 矢量瓦片style 传 url 情况下相对路径不全

Author: xilanhuaweidapao

src/openlayers/overlay/VectorTileSuperMapRest.js

@@ -317,6 +317,7 @@ export class VectorTileSuperMapRest extends VectorTile {
               withCredentials: options.withCredentials,
               headers: options.headers
             });
+            this.baseUrl = url;
             style = await response.json();
           }
           await this._fillByStyleJSON(style, options.source);