[BUGFIX] Settingsservice must not be a singleton

Singleton will lead to troubles with e.g. different detailPid

Change-Id: Ibf0872434b00e61f6d50353ab950180a7010225c
Resolves: #57954
Reviewed-on: https://review.typo3.org/29939
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer