[BUGFIX] Using ext:sys_action gives a warning about not valid HTML

When ext:sys_action is installed it will give a warning about
not valid HTML. This is because the id="" and class="" are glued
to each other. Fix this by moving the space from the front to the
back.

Change-Id: Ia916a9e084cb9f3595164215cf22a100d64dc7a9
Resolves: #52202
Releases: 6.2
Reviewed-on: https://review.typo3.org/24001
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer