Tests: removed leftover from h2_server_push.t.

h2_server_push.t

diff --git a/h2_server_push.t b/h2_server_push.t
index d555960..b12294e 100644
--- a/h2_server_push.t
+++ b/h2_server_push.t
@@ -113,8 +113,6 @@
         location /gzip.html {
             gzip on;
             gzip_min_length 0;
-
-            http2_push /gzip.html;
             return 200 PROMISED;
         }
     }