Add unique week check in formatNumericWeeks

[jloh02]

Context

3648

Implementation

TimetableCell formatNumericWeeks does a check to ensure listed weeks are unique. Also update condition for change in week <= 1 instead

Other Information

Instead of simply ensuring unique, should we also sort the weeks and maintain the <= 1 condition?

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 53.62%. Comparing base (711a6da) to head (eba7f1b).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #3677 +/- ## ========================================== + Coverage 53.60% 53.62% +0.01% ========================================== Files 272 272 Lines 5977 5979 +2 Branches 1428 1428 ========================================== + Hits 3204 3206 +2 Misses 2773 2773 ```

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