[BUGFIX] Write references for FAL relations

Due to commit https://review.typo3.org/37086 no FAL relations for RTE
fields are added to sys_refindex. This patch removes the introduced
prevention of double indexes. Further more file relations are only added
if no softref is defined in the field configuration.

Resolves: #66243
Releases: master, 6.2
Change-Id: I19c6327ad13c299466737b564bf5069d4d6cb851
Reviewed-on: http://review.typo3.org/38598


Reviewed-by: Markus Klein <klein.t3@reelworx.at>
Tested-by: Markus Klein <klein.t3@reelworx.at>
Reviewed-by: Xavier Perseguers <xavier@typo3.org>
Tested-by: Xavier Perseguers <xavier@typo3.org>
Reviewed-by: Nicole Cordes <typo3@cordes.co>
Tested-by: Nicole Cordes <typo3@cordes.co>