The "lock_timeout" (set by OCC command) timer should start ONLY if there are no more users in the file

[tomdereub]

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Steps to reproduce

Bug description here : #292
Bug is still present with nextcloud 30.0.6 and files_lock app 30.0.1

Expected behaviour

The lock_timeout countdown should ONLY start when there's no one left in the file

Actual behaviour

The lock_timeout countdown start when the file is opened.

[tomdereub]

It seems that the refreshing locks functionality could be used for that : http://www.webdav.org/specs/rfc4918.html#refreshing-locks