[FOLLOWUP] Revamp EXT:recycler

Fix a few coding issues in new EXT:recycler

* Remove IDE warnings
* Correct phpDoc
* Remove an unused variable
* Introduce a int typecast of GP:id
* Replace spaces with tabs

Change-Id: I8eaadd51c29506958d7fa80c375ddf943dfbac2f
Resolves: #64844
Releases: master
Reviewed-on: http://review.typo3.org/36646


Reviewed-by: Andreas Fernandez <andreas.fernandez@aspedia.de>
Tested-by: Andreas Fernandez <andreas.fernandez@aspedia.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>