fixup! refactor: move baseUrl fallback logic to paths-plugin.ts

Author: alan-agius4

packages/angular_devkit/build_angular/src/builders/browser/tests/options/allowed-common-js-dependencies_spec.ts

@@ -122,7 +122,7 @@ describeBuilder(buildWebpackBrowser, BROWSER_BUILDER_INFO, (harness) => {
         const tsconfig = JSON.parse(content);
         tsconfig.compilerOptions ??= {};
         tsconfig.compilerOptions.paths = {
-          '@app/*': ['src/app/*'],
+          '@app/*': ['./src/app/*'],
         };
 
         return JSON.stringify(tsconfig, null, 2);