Processed metrics processed when reports are flattened (#10933)

tests/PHPUnit/System/expected/test_reportLimiting_flattened__Referrers.getWebsites_day.xml

 <?xml version="1.0" encoding="utf-8" ?>
 <result>
-	<row>
-		<label>Others</label>
-		<nb_uniq_visitors>2</nb_uniq_visitors>
-		<nb_visits>2</nb_visits>
-		<nb_actions>2</nb_actions>
-		<nb_users>0</nb_users>
-		<max_actions>1</max_actions>
-		<sum_visit_length>0</sum_visit_length>
-		<bounce_count>2</bounce_count>
-		<nb_visits_converted>0</nb_visits_converted>
-	</row>
 	<row>
 		<label>whatever0.com/-1</label>
 		<nb_uniq_visitors>2</nb_uniq_visitors>
@@ -59,4 +48,15 @@
 		<nb_visits_converted>0</nb_visits_converted>
 		<url>http://whatever1.com/0</url>
 	</row>
+	<row>
+		<label>Others</label>
+		<nb_uniq_visitors>2</nb_uniq_visitors>
+		<nb_visits>2</nb_visits>
+		<nb_actions>2</nb_actions>
+		<nb_users>0</nb_users>
+		<max_actions>1</max_actions>
+		<sum_visit_length>0</sum_visit_length>
+		<bounce_count>2</bounce_count>
+		<nb_visits_converted>0</nb_visits_converted>
+	</row>
 </result>
\ No newline at end of file