Focus lost from modal window after cloning element.

Steps to reproduce:

1. Create SLA (Services -> SLA).
2. Open the created SLA and press clone
3.  Press tab multiple times, so that focus is going out of the form.

Result: Possible to interact with background items. See: SLA_focus_cloning.mp4

Expected: Focus remains within the modal window.

Note: This affects Maintenance, Event correlation, Discovery rule,  Action, Scripts, API token (after pressing regenerate), and possibly other configuration forms.

Some forms function correctly in Chrome but has the same bug in the Safari browser (for example,  Media type test popup after pressing test).