Remove redundant u() from PostRepository::extractSearchTerms()
Remove redundant u() from PostRepository::extractSearchTerms()

These redundant u() cause type errors when using
declare(strict_types = 1).

TomasVotruba/symfony-demo,voronkovich/symfony-demo,javiereguiluz/symfony-demo,symfony/symfony-demo,javiereguiluz/symfony-demo,javiereguiluz/symfony-demo,bocharsky-bw/symfony-demo,symfony/symfony-demo,bocharsky-bw/symfony-demo,symfony/symfony-demo,TomasVotruba/symfony-demo,voronkovich/symfony-demo,bocharsky-bw/symfony-demo,voronkovich/symfony-demo,TomasVotruba/symfony-demo