Prevent sending second WWW-Authenticate header
Overrides \Sabre\DAV\Auth\Backend\AbstractBearer::challenge to prevent sending a second WWW-Authenticate header which is standard-compliant but most DAV clients simply fail hard. Fixes https://github.com/nextcloud/server/issues/5088 Signed-off-by: Lukas Reschke <lukas@statuscode.ch>
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