remove unused dryRun option

Co-Authored-By: Jakob Ackermann <das7pad@outlook.com>

services/document-updater/app/coffee/HttpController.coffee

@@ -219,7 +219,6 @@ module.exports = HttpController =
 		options = 
 			limit : req.query.limit || 1000
 			timeout: 5 * 60 * 1000
-			dryRun : req.query.dryRun || false
 			min_delete_age: req.query.min_delete_age || 5 * 60 * 1000
 		res.send 204
 		# run the flush in the background