Sets a stream handler in FDroidApp which understands bluetooth://
URLs and returns a non-functioning URL handler for such URLs.
The reason it is non-funcitoning is because the openConnection()
function is not being used by the BluetoothDownloader at this point.
In the absense of this, a MalformedURLException is thrown.
The bluetooth stuff is still broken, but it is not broken in
this way any more.
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