Improve ICANN reporting golden query test

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=159570806

python/google/registry/reporting/testdata/golden_activity_query.sql

@@ -12,6 +12,8 @@
 -- See the License for the specific language governing permissions and
 -- limitations under the License.
 
+-- END OF HEADER
+
       SELECT
         Tld.tld AS tld,
         SUM(IF(metricName = 'operational-registrars', count, 0)) AS operational_registrars,