modofied use test code for Statistics::Client -> EventService::Client

Author: AnaTofuZ

spec/support/shared_contexts/statistics.rb

@@ -14,7 +14,7 @@
   end
 
   before do
-    allow_any_instance_of(Statistics::Client).to receive(:connection_for).and_return(stub_connection)
+    allow_any_instance_of(EventService::Client).to receive(:connection_for).and_return(stub_connection)
   end
 end