fix: add angular material theme to form data challenge

Author: jdegand

apps/forms/avoid-losing-form-data/project.json

@@ -20,7 +20,10 @@
  "apps/forms/avoid-losing-form-data/src/favicon.ico",
  "apps/forms/avoid-losing-form-data/src/assets"
  ],
- "styles": ["apps/forms/avoid-losing-form-data/src/styles.scss"],
+ "styles": [
+ "apps/forms/avoid-losing-form-data/src/styles.scss",
+ "./node_modules/@angular/material/prebuilt-themes/indigo-pink.css"
+ ],
  "scripts": []
  },
  "configurations": {