Remove comment

firefox_ios/views/counters.view.lkml

@@ -1,7 +1,7 @@
 view: counters {
   derived_table: {
     sql:
-    SELECT -- Group by client-id, date
+    SELECT
         client_info.client_id,
         CAST(DATE(submission_timestamp) AS TIMESTAMP) AS submission_date,
         key,