[BUGFIX] Search in Install Tool must find input values

Resolves: #77356
Releases: master, 7.6
Change-Id: I6127c03de37eb5b60dc13217e1f7528a4b628fa4
Reviewed-on: https://review.typo3.org/49390


Tested-by: Bamboo TYPO3com <info@typo3.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>