Update API for statistics (replace corpusQuery parameters with cq)

Change-Id: Ie1e9b9a6c30fd6957a372d47d09119b9a97dad43
diff --git a/t/server/mock.pl b/t/server/mock.pl
index 2b998ab..961c6ea 100644
--- a/t/server/mock.pl
+++ b/t/server/mock.pl
@@ -177,11 +177,11 @@
 get '/v1.0/statistics' => sub {
   my $c = shift;
   my $v = $c->validation;
-  $v->optional('corpusQuery');
+  $v->optional('cq');
 
   my @list = 'corpusinfo';
-  if ($v->param('corpusQuery')) {
-    push @list, $v->param('corpusQuery');
+  if ($v->param('cq')) {
+    push @list, $v->param('cq');
   };
   my $slug = slugify(join('_', @list));