[TASK] Change duplicate icon identifiers to actions-add

The following icons which were previously used in the Install tool
were all replaced by "actions-add" which acts as a synonym.

* actions-edit-add

Releases: master
Resolves: #80603
Change-Id: Ie35e600799f49d53e68a2308d8e9f007189cdbdd
Reviewed-on: https://review.typo3.org/52289


Reviewed-by: Frank Naegler <frank.naegler@typo3.org>
Tested-by: Frank Naegler <frank.naegler@typo3.org>
Reviewed-by: Benjamin Kott <benjamin.kott@outlook.com>
Tested-by: Benjamin Kott <benjamin.kott@outlook.com>