Delete item confirmation page is broken

[abollini]

Describe the bug
If you try to delete an item the confirmation page is currently broken. Confirming the delete operation will trigger NO rest call

To Reproduce
Steps to reproduce the behavior:

1. login as administrator
2. visit an item, i.e https://demo7.dspace.org/items/209eba26-7f6a-4f53-b0d4-21d6f96f8722
3. try to delete it, no call to the REST API are performed

Expected behavior
It should work ;)

[firoball]

I think this issue might relate (see discussion after closure):

#1481