Remove old about:home url from acceptance tests.
Remove old about:home url from acceptance tests.

mozilla/snippets-service,glogiotatidis/snippets-service,mozmar/snippets-service,glogiotatidis/snippets-service,mozilla/snippets-service,mozmar/snippets-service,mozilla/snippets-service,glogiotatidis/snippets-service,glogiotatidis/snippets-service,mozmar/snippets-service,mozmar/snippets-service,mozilla/snippets-service