[BUGFIX] Use hashtags provided by Twitter api

Move the hashtag link generation to internal handling as Twitter api
provides all needed information.

Resolves: #53881
Change-Id: Ie56d942bfcef0aa5ff86bc5c625f3b305f5f2b49
Reviewed-on: https://review.typo3.org/26735
Reviewed-by: Nicole Cordes
Tested-by: Nicole Cordes