[BUGFIX] Use BackendUtility::deleteClause in LinkAnalyzer

To avoid wrong sql statements the method BackendUtility::deleteClause
must be used.

Resolves: #76628
Releases: master, 7.6
Change-Id: Ida8165b501c4898d2b79586710b2921f47d6963f
Reviewed-on: https://review.typo3.org/48575


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Nicole Cordes <typo3@cordes.co>
Tested-by: Nicole Cordes <typo3@cordes.co>
Reviewed-by: Joerg Boesche <typo3@joergboesche.de>
Tested-by: Joerg Boesche <typo3@joergboesche.de>
Reviewed-by: Frank Naegler <frank.naegler@typo3.org>
Tested-by: Frank Naegler <frank.naegler@typo3.org>