[TASK] runTests.sh: clean summary in verbose mode

The 'summary' section at the end of runTests.sh is
cluttered with command output if -v is given.
Suppress this by setting 'set +x' before summary
output.

Resolves: #93360
Releases: master, 10.4, 9.5
Change-Id: I1a9d3126d160d25fc2b87b0b7c5ec0c0c59b689d
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/67523


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Jochen <rothjochen@gmail.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Jochen <rothjochen@gmail.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>