Loki: Remove unnecessary type extension (#64883)

remove unnecessary type extension

public/app/plugins/datasource/loki/datasource.ts

@@ -257,7 +257,7 @@ export class LokiDatasource
       .map(getNormalizedLokiQuery) // "fix" the `.queryType` prop
       .map((q) => ({ ...q, maxLines: q.maxLines ?? this.maxLines }));
 
-    const fixedRequest: DataQueryRequest<LokiQuery> & { targets: LokiQuery[] } = {
+    const fixedRequest: DataQueryRequest<LokiQuery> = {
       ...request,
       targets: queries,
     };