Fixes #6554/BZ1095965 - fix path to asset in jquery-ui.

The path to ui-bg_highlight-hard_75_dadada_1x100.png was
incorrect, this commit fixes the path.

http://projects.theforeman.org/issues/6554
https://bugzilla.redhat.com/show_bug.cgi?id=1095965
Merge pull request #4412 from waldenraines/6554

Fixes #6554/BZ1095965 - fix path to asset in jquery-ui.