[web] Fix screenshot tests running locally (#31054)
[web] Fix screenshot tests running locally (#31054)


jason-simmons/flutter_engine,flutter/engine,devoncarew/engine,flutter/engine,jason-simmons/flutter_engine,devoncarew/engine,devoncarew/engine,jason-simmons/flutter_engine,flutter/engine,rmacnak-google/engine,flutter/engine,chinmaygarde/flutter_engine,devoncarew/engine,flutter/engine,chinmaygarde/flutter_engine,rmacnak-google/engine,rmacnak-google/engine,rmacnak-google/engine,flutter/engine,chinmaygarde/flutter_engine,chinmaygarde/flutter_engine,chinmaygarde/flutter_engine,jason-simmons/flutter_engine,jason-simmons/flutter_engine,chinmaygarde/flutter_engine,flutter/engine,devoncarew/engine,jason-simmons/flutter_engine,rmacnak-google/engine,devoncarew/engine,rmacnak-google/engine,devoncarew/engine,rmacnak-google/engine,flutter/engine,jason-simmons/flutter_engine,jason-simmons/flutter_engine,chinmaygarde/flutter_engine