[TASK] Add clear button for search in TypoScript Object Browser

Resolves: #48935
Releases: master
Change-Id: Ibbd57f0f140606ceb1bd64da93ef93cb316a1336
Reviewed-on: http://review.typo3.org/43576


Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>
Reviewed-by: Michael Oehlhof <typo3@oehlhof.de>
Tested-by: Michael Oehlhof <typo3@oehlhof.de>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>