Comments dav requests ignore file id

[skjnldsv]

1. open a file sidebar
2. add a comment
3. open another file sidebar
4. see the comment from the previous file appear on this file as well
5. see the network requests use the second file id and the first comment id still returning a proper response

@rullzer @MorrisJobke @danxuliu

[nextcloud-bot]

GitMate.io thinks possibly related issues are #8858 ((please ignore)), #4 (File requests / Files Drop for the community), #9969 (Enable sabre/dav's locking feature [feature request]), #5554 (Apps files from theme are being ignored), and #9955 (Request a valid property for DAV opendir).