Update detect_web_access_to_decommissioned_s3_bucket.yml

fix tests key again

Author: pyth0n1c

detections/web/detect_web_access_to_decommissioned_s3_bucket.yml

@@ -51,7 +51,7 @@ tags:
   - Splunk Enterprise Security
   - Splunk Cloud
   security_domain: network
- tests:
+tests:
 - name: Baseline Dataset Test
   attack_data:
   - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1485/decommissioned_buckets/cloudtrail.json