Revert "[BUGFIX] Extension Security Report goes green if TER was never fetched"

The change does not consider the "old old EM", which does not update
the repository timestamp in sys_ter properly. Hence the reports module
does not show adequate information, even though the TER was fetched
properly by the "old old EM".

This reverts commit d4439a159896954b93cfbe020d879e0f8eab98f9

Change-Id: I142c0cdf2faff12deb57cb04aafb72e89406d96b
Releases: 4.5
Reviewed-on: https://review.typo3.org/21006
Reviewed-by: Markus Klein
Tested-by: Markus Klein