[BUGFIX] Remove needless "x " on TER-search

Keep input field after search for easy re-search.

Change-Id: I658657c89a91e5196ca5a2997d76bc0bba52c820
Fixes: #43410
Releases: 6.0, 6.1
Reviewed-on: https://review.typo3.org/19318
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn