remove unused variable (#175)

diff --git a/provider/lib/utils.js b/provider/lib/utils.js
index 943dbe2..16845cc 100644
--- a/provider/lib/utils.js
+++ b/provider/lib/utils.js
@@ -195,7 +195,6 @@
                     self.sanitizer.deleteTriggerAndRules(triggerData);
                 }
                 else {
-                    var auth = triggerData.apikey.split(':');
                     self.sanitizer.deleteTrigger(triggerData, 0)
                     .then(info => {
                         logger.info(method, triggerIdentifier, info);