[api] add the view for the previous change - forgot git add

src/api/app/views/statistics/active_request_creators.xml.builder

@@ -0,0 +1,10 @@
+
+xml.active_request_creators(project: @project.name) do
+  @stats.each do |month, monthstats|
+    xml.per_month(month: month) do
+      monthstats.each do |creator, email, count|
+        xml.creator(login: creator, email: email, count: count)
+      end
+    end
+  end
+end