users: User deletion doesn't work

When confirming a user deletion, the user edit form is not submitted. Also, after cancelling the user deletion confirmation dialog, the user form submit buttons stays disabled.

Seems like the issue is related to deferring user.js file in commit c45bdf56, that made loading javascript files in correct order. Before, the user.js file was loaded before main.js and the submit button didn't get disabled when the user deletion confirmation dialog opened.