mail: Always quote uncoded names in MailAddress

mail: Always quote uncoded names in MailAddress

Otherwise, names that contain whitespace (but no special characters
that need Q-encoding) will be sent as-is in an email header. While
that's valid by RFC 1036, RFC 5322 and others, some mail programs
fail to correctly process spaces. Avoid these problems by simply
quoting the name always - except for cases which are Q-encoded,
which must remain unquoted to be valid (and also cannot contain
spaces, thus unaffected).

Before:
> From: Foo Bar <fb@example.org>

After:
> From "Foo Bar" <fb@example.org>

Update test to work with the new criteria.

Bug: T191931
Change-Id: I4b2a0a80e8b43ecc943939fc5ebaa356a4f840e0