App still uses `oc_requesttoken` which is deprecated and scheduled for removal

[susnux]

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Steps to reproduce

Search code for oc_requesttoken

Expected behaviour

Not using oc_requesttoken as deprecated since Nextcloud 17 and scheduled for removal since Nextcloud 20 (will be removed in Nextcloud 35).

Actual behaviour

Still some files use oc_requesttoken

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Either use OC.requestToken or getRequestToken from @nextcloud/auth (see https://nextcloud-libraries.github.io/nextcloud-auth/functions/getRequestToken.html )