dsl: Correct retention of wrong branch in filter_ordered

[EdCaunt]

… of python 3.7

[codecov[bot]]

Codecov Report

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

Project coverage is 86.81%. Comparing base (779aa09) to head (5368999).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2377 +/- ## ========================================== - Coverage 86.82% 86.81% -0.01% ========================================== Files 233 233 Lines 43770 43759 -11 Branches 8077 8076 -1 ========================================== - Hits 38003 37990 -13 - Misses 5060 5061 +1 - Partials 707 708 +1 ```

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