Fix pipes behaviour in mock server to be consistent with Kustvakt

Change-Id: I11c5c1b1d725f5b5d0de9a44e20edc0a9528db64
diff --git a/t/query.t b/t/query.t
index 4cf5a06..37bcdcb 100644
--- a/t/query.t
+++ b/t/query.t
@@ -270,7 +270,7 @@
 $t->get_ok('/?q=baum&pipe=glemm')
   ->status_is(200)
   ->text_is('#error','')
-  ->content_like(qr/\"pipe\":"glemm"/)
+  ->content_like(qr/\"pipes\":"glemm"/)
   ;