[BUGFIX] Use correct setting to display search rules

The extbase plugin (pi2) of EXT:indexed_search previously used a
different TypoScript setting to control the display of search rules
than the setting that is shipped as default TypoScript. This changes
the template to use the correct setting.

Resolves: #51099
Releases: master, 7.6
Change-Id: I893ff0c85a3bc9fde885cbb5103d9ebf54e488a2
Reviewed-on: https://review.typo3.org/46002


Reviewed-by: Bernhard Kraft <kraftb@think-open.at>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Bernhard Kraft <kraftb@think-open.at>
Reviewed-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Tested-by: Morton Jonuschat <m.jonuschat@mojocode.de>