Make sure financial_type_id is set when a contribution is created

Overview

When a contribution is created via a contribution page (with a confirmation page) the parameter financial_type_id is not set if the contribution is not being created with a recurring contribution.

PR: https://github.com/civicrm/civicrm-core/pull/11907

Before

financial_type_id is not set when a non-recurring contribution is submitted via a contribution page (with a confirmation page). But it is set when a recurring contribution is being created at the same time.

After

financial_type_id is always set for contribution params when submitted via a contribution page (with a confirmation page). This makes it more consistent for use in payment processor extensions etc.