Get url path before unquote + change Thumbnail check

Get the url path before using unquote, circumventing problems with encoded special characters like '?'.
Get rid of the paths leading '/' so that the following if statements still work (this also gets rid of .lstrip(config['VIDEOPREFIX'])).
Change the auth check for thumbnails, from checking the ending('.jpg') to checking the beginning ('thumbnails/').

Auch wenn hier halb OT: wie hat der check startswith('pub/hls/') jemals funktioniert wenn man vorher .lstrip(config['VIDEOPREFIX']) benutzt hat?
lstrip nimmt ja alle trailing characters weg die es gegeben bekommt und nicht nur einen prefix der dem gegebenen string entspricht (siehe dazu auch https://stackabuse.com/python-remove-the-prefix-and-suffix-from-a-string/).

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• 7e2b5653 - Strip the videoprefix and the following / from the path.

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• 0b5e2163 - check if prefix is present, else return 500

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• 9b0b858d - tidy up prefix check.

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merged