content host > details > errata page improperly using input-group for action buttons
See attachment for details. discussion here: https://github.com/Katello/katello/pull/6274
Fixes #16367: fix styling of buttons on CH errata page.
The styling of the buttons on the content host errata page was broken
because we were using an .input-group instead of a .button-group. Since
these buttons are not in a form they should be using a .button-group.