Allow `show_dialog_deletion` to be set for new users by default

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Is your feature request related to a problem? Please describe.

Users can configure to be asked to confirm file or folder deletions. But as far as I can tell this settings needs to be configured for each user explicitly.

Describe the solution you'd likeshow_dialog_deletion`

I would like a global option that sets show_dialog_deletion in the oc_preferences table for new users automatically.

Describe alternatives you've considered

I don't think there are any alternatives for this beside reworking the will a user be asked to confirm a deletion workflow completely.

Additional context

Even if files/folders are recoverable from the trashbin, this process can take a moment, and if this happens with a folder that is shared amongst many users, this process can be a bit stressful, and lead to unexpected inconsistencies with files that were edited during the deletion. So making sure that a 100GB folder actually needs to be deleted would have been good 😅

Start by tracing how new users are created and how the show_dialog_deletion preference is written to the oc_preferences table. Identify where a global default could be applied, then verify that newly created users receive the setting automatically without changing existing users.