Feature: Update buttons in edit user role dialog

[heosman]

Tasks:

• [x] When edit user role dialog is opened, change "Edit" button to "Cancel" button. Clicking cancel button should revert user card to original state.
• [x] Once a role is chosen, "Done" button should appear next to Cancel button. User role should only change once "Done" button is clicked.
• [x] Change edit icon next to "Done" to checkmark icon on the right side