[TASK] Doctrine: Migrate extbase Typo3DbBackend

Two very last calls to exec_SELECTgetSingleRow()

Change-Id: I0e98ea0de22f60dbc5df72be52b345220c54c0ba
Resolves: #78205
Releases: master
Reviewed-on: https://review.typo3.org/50148


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Tested-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Reviewed-by: Manuel Selbach <manuel_selbach@yahoo.de>
Tested-by: Manuel Selbach <manuel_selbach@yahoo.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>