[IMP] web: qunit_config: hide passed tests by default

Tests are executed a bit faster in the browser when passed tests
are hidden.

addons/web/static/tests/helpers/qunit_config.js

@@ -33,6 +33,10 @@ QUnit.config.autostart = false;
  */
 QUnit.config.testTimeout = 1 * 60 * 1000;
 
+/**
+ * Hide passed tests by default in the QUnit page
+ */
+QUnit.config.hidepassed = true;
 
 var sortButtonAppended = false;