[TASK] Web>Page Search: Remove duplicate CSS

Due to centralized standard styles for standard elements no
further special CSS definition is necessary.

Also removes an excessive closing bracket in CSS.

Resolves: #57451
Releases: 6.2
Change-Id: I54d1bacce4774a7cc6924870985cb747cc3b5a89
Reviewed-on: https://review.typo3.org/28972
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer