set chunks period to 24 hours so that we can retain chunks shorter

flux2/apps/monitoring/loki-values-configmap.yaml

@@ -39,6 +39,8 @@ data:
             index:
               prefix: index_
               period: 24h
+            chunks:
+              period: 24h
       storage_config:
         boltdb_shipper:
           active_index_directory: /data/loki/boltdb-shipper-active
@@ -58,4 +60,3 @@ data:
       table_manager:
         retention_deletes_enabled: true
         retention_period: 168h  # 7 days
-