[BUGFIX] Spelling of namespace \TYPO3\CMS\Tstemplate

In some places a wrong namespace \TYPO3\CMS\TsTemplate was used.
\TYPO3\CMS\Tstemplate is the correct namespace for the tstemplate
sysext.

This fixes a problem in links between TSOB and Template Analyzer.

Resolves: #55764
Releases: 6.2
Change-Id: Iad84baa842b68f18468c1ff6b92c75c09710815e
Reviewed-on: https://review.typo3.org/27415
Reviewed-by: Anja Leichsenring
Tested-by: Anja Leichsenring
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn