fix(form) : add previous btn to go to previous url

src/app/app.component.ts

src/app/form/footer-form/footer-form.component.html

src/app/form/footer-form/footer-form.component.ts

src/app/form/form.component.html

src/app/form/form.component.scss

src/app/form/form.component.ts

src/app/services/routerListener.service.ts