[FEATURE] Show a special image for official distributions in EM

For official distributions a special image is displayed in the "Get
preconfigured distribution" list. So it is easier now to distinguish
the official distributions from others.

Resolves: #68773
Releases: master
Change-Id: I5a6b1b5925e9c61af984b1b0faaea5711973549e
Reviewed-on: http://review.typo3.org/42292


Reviewed-by: Frank Nägler <frank.naegler@typo3.org>
Tested-by: Frank Nägler <frank.naegler@typo3.org>
Reviewed-by: Susanne Moog <typo3@susannemoog.de>
Tested-by: Susanne Moog <typo3@susannemoog.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>