New Contact autocomplete gives form error even if you select a Contact.

CRM-5479, fix causes problems if you use tab / keyboard go move through the fields. It looks like the contact_id is not actually set in the "contact" ac_input field unless I use my mouse to click to the Contribution Type field after selecting a contact.

To recreate:

• New Contribution (standalone context).
• Start typing in a last name and use down arrow to select one
• tab thru to Contribution type and select it by typing 'D' for donation
• tab to Total amount and type in a value
• click enter (or press return key)

You'll get form validation error: "Please select a contact or create new contact"