[TASK] Indexed Search: remove getter and setter for search word

The `sword` property and its getter/setter are used within the
`SearchController` only. The getter and setter have been removed, the
property is used directly.

Resolves: #102940
Releases: main
Change-Id: I4c0032b3fd19dfe18e5ebb82e2d78f04398678af
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/82655


Reviewed-by: Guido Schmechel <guido.schmechel@brandung.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>