Media Viewer :: Prompt to Override Deletion Lock instead of posting a notification.

[bbappserver]

When I attempt to delete an item with a deletion lock, I would expect hydrus to inform me and ask if I want to bypass it. Right now it just fails and pushes a notification which you might not even notice.

This can get quite annoying if a certai nset of things got accidentally archived and you are trying to sort through the stuff you want to keep and the stuff you don't for a particular tag.

 ===========================================[x]
 |<N> items in selection are delete locked.   |
 |                      [delete anyway] [ok]  |
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