Remove redundant setupTest invocation.

This resolves the error when using ember-destroyable-polyfill and
calling `setupContext` (from `@ember/test-helpers`) multiple times with
the same test context.

Author: rwjblue

tests/unit/qunit/filter-test-modules-test.js

@@ -7,8 +7,6 @@ if (macroCondition(dependencySatisfies('ember-qunit', '*'))) {
   let { setupTest } = importSync('ember-qunit');
 
   module('Unit | Qunit | filter-test-modules', function(hooks) {
-    setupTest(hooks);
-
     module('covertFilePathToModulePath', function(hooks) {
       setupTest(hooks);