Update to determine sis enrollment sections

Changes for sections:

(1) SIS section id that matches the current course instance id, will appear first on the list

(2) Those sections with a sis section id which is also a course instance id will appear above those sections that either do not have a sis section id or does not have a course instance id
There's undoubtedly a way to combine the two regexes into one more complex matcher and avoid the 'or', but I like the simplicity of doing it in two easily comprehended pieces, too.