[FOLLOWUP][TASK] Use only one instance of iconFactory per class

Resolves: #70550
Releases: master
Change-Id: Id3e07fbb8416fa8bd404b480bea6d4c041330b5d
Reviewed-on: http://review.typo3.org/43946


Reviewed-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Tested-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Reviewed-by: Nicole Cordes <typo3@cordes.co>
Tested-by: Nicole Cordes <typo3@cordes.co>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>