fixup! fix(@angular/build): emit error for invalid self-closing element in i… …ndex HTML

Co-authored-by: Charles <19598772+clydin@users.noreply.github.com>

Author: alan-agius4

packages/angular/build/src/utils/index-file/augment-index-html_spec.ts

@@ -518,7 +518,7 @@ describe('augment-index-html', () => {
       expect(errors).toEqual([`Invalid self-closing element in index HTML file: '<app-root />'.`]);
     });
 
-    it('should not return an error when used on a not supported element', async () => {
+    it('should not return an error when used on a supported element', async () => {
       const { errors } = await augmentIndexHtml({
         ...indexGeneratorOptions,
         html: `