Add 'All' element to the 'Locate a User' role preselector list

Describe the problem you would like to solve
Easier and faster user search functionality

Describe the solution you’d like
When you ‘locate a user’ you have to select the user category first.
Please add a (defalt) ‘All’ element to this list

Who is asking for this feature?
Journal Editors, Journal Administrators, Reviewers