[BUGFIX] Add missing break in FieldProcessor_Service

Adds a break to the switch/case statement in
Tx_Solr_FieldProcessor_Service

Resolves: #62086
Change-Id: Ie0e9c0f0b6b6a0c719fafcf6eb966f3499d82ff3
Reviewed-on: http://review.typo3.org/33190
Reviewed-by: Sascha Egerer <sascha@sascha-egerer.de>
Tested-by: Sascha Egerer <sascha@sascha-egerer.de>