Pop up modals don't accept key input - element that invoked them remains "focused"

[AlexJFox]

When attempting to unassign members from the Edit Group section, I would expect to be able to press "enter" when the "Unassign User" modal is displayed, but this invokes the modal once again and applies an additional background filter which makes the screen darker. It is possible to press enter many times and invoke many modals and make the screen completely black this way.

[NGPixel]

Fixed via 8ceddd3. Will land in next release.