test: remove contents of main.ts from polyfill tests

These test do not need the contents of the `main.ts`

Author: alan-agius4

tests/legacy-cli/e2e/tests/basic/test.ts

@@ -21,9 +21,6 @@ export default async function () {
             require('karma-coverage'),
             require('@angular-devkit/build-angular/plugins/karma')
           ],
-          client: {
-            clearContext: false // leave Jasmine Spec Runner output visible in browser
-          },
           reporters: ['progress', 'kjhtml'],
           port: 9876,
           colors: true,