fix: only add the polyfill file for apps using angular <v15

Author: ocombe

angular/templates/generators/ng-app/index.ts

@@ -42,7 +42,7 @@ export class NgAppTemplate implements ComponentTemplate {
       gitKeepFile(),
     ];
 
-    if (this.angularVersion >= 15) {
+    if (this.angularVersion < 15) {
       files.push(
         // starting from Angular 15, the `polyfills` option accept an array of module specifiers.
         // https://github.com/angular/angular-cli/commit/597bfea1b29cc7b25d1f466eb313cbeeb6dffc98

angular/templates/generators/ng-app/template-files/tsconfig.app.ts

@@ -37,8 +37,8 @@ export const tsconfigFile = (angularVersion: number): ComponentFile => {
     "strictInputAccessModifiers": true
   },
   "files": [
-    "./src/main.ts",
-    "./src/polyfills.ts"
+    "./src/main.ts"${angularVersion >= 15 ? `` : `,
+    "./src/polyfills.ts"`}
   ],
   "include": [
     "./src/**/*.d.ts"