Supervised Order with OBSERVER permissions shows too many buttons on MyDSpace.

[tdonohue]

Describe the bug
Discovered during final testing of #2019

The issue is on the "MyDSpace -> Supervised Items" when "OBSERVER" permissions are assigned. Obviously, if you are just an OBSERVER, you should only be able to view the Item. But, the buttons displayed imply you can do more.

Here's want an OBSERVER sees on MyDSpace:

(I'd expect that the "Delete" and "Edit" Buttons should not appear. They should only have the "View" option")

That said, I've confirmed that clicking "Delete" doesn't work. If the OBSERVER clicks "Edit", they are able to load the submission form... but they are unable to save any changes to the form.

To Reproduce
Steps to reproduce the behavior:

1. Login as an Admin & create a Supervision Order (from Administrative Workflow), assigning a Group with OBSERVER permissions
2. Logout & Login as a member of that group
3. Go to "MyDSpace -> Supervised Items". Verify you see the Supervised Item, but also see an "Edit" and "Delete" button.

Expected behavior
Edit & Delete button should not appear on MyDSpace page for the OBSERVER role. An OBSERVER can only view the supervised item.

Related work
Related to #2019

[tdonohue]

@atarix83 : This is the final (minor) issue that I located in #2019. If there's a very quick fix, let me know & we could still try to get it into 7.5. If it needs work / more analysis, then we'll wait till 7.6 to resolve this.