Use comment status and type to set $maybe_notify default

[adamsilverstein]

Trac ticket: https://core.trac.wordpress.org/ticket/64217

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Props adamsilverstein, westonruter, jorbin.

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[westonruter]

Thanks to the above, this can now be simplified:

Suggested change

	$is_note = ( $comment && 'note' === $comment->comment_type );
	$is_note = ( 'note' === $comment->comment_type );

[westonruter]

Note: hereafter in this function, it should really use $comment->comment_ID (or whatever the field is) instead of $comment_id because the get_comment() function has a filtered return value, so a plugin could potentially substitute the comment with something completely different (although they probably wouldn't).