TestingFileStorage doesn't pass through headers argument to parent class

[djmattyg007]

The code is hard-coded to pass None to the Werkzeug FileStorage class, rather than passing through the headers keyword argument.

Also it's typed as Any, rather than as werkzeug.Headers like the doc comment implies.

[jugmac00]

Thanks for your report.

Would you like to provide a pull request?

[VardhanHegde]

Hey @jugmac00 , I am new to open source and trying to give my contributions during hacktoberfest. If solution is provided, will it be considered as a hacktoberfest contribution ?