[issue_tracker] User with permission "Create/Edit Own Issues and Comment on All Issues" is not actually been able to edit it's own issues once created.

[racostas]

Describe the bug
While playing a bit with the issue tracker module I found that a user having only the permission Issue Tracker: Create/Edit Own Issues and Comment on All Issues but not the Issue Tracker: Close/Edit/Re-assign/Comment on All Issues is not actually been able to "Edit" its own issues. The user is only been able to comment.

To Reproduce
Steps to reproduce the behavior (attach screenshots if applicable):

1. Please log in to LORIS with a user having only the Issue Tracker: Create/Edit Own Issues and Comment on All Issues but not the Issue Tracker: Close/Edit/Re-assign/Comment on All Issues (and not super admin user neither).
   
2. Go the issue tracker module ( MainMenu->Tools->Issue Tracker) and create a new issue.
3. Then save the new issue and go to the previous page and try to edit the issue again.
4. You will notice you are not able to "edit" the issue, only to comment on it

What did you expect to happen?
According to the Permission description (and what seems logic), a user with this permission should be able to edit the issue that he created.