[BUGFIX] Fix HTML structure for buttons in EM

This adds a missing wrap for the actions buttons in EM.
(Get Extensions view only)

Resolves: #63460
Releases: master, 6.2
Change-Id: Ifcc32f95995d2df976589e756b17afacfd39665b
Reviewed-on: http://review.typo3.org/34825
Reviewed-by: Markus Klein <klein.t3@reelworx.at>
Tested-by: Markus Klein <klein.t3@reelworx.at>