Move DEFAULT_COLOR to vis

[codecov[bot]]

Codecov Report

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

Project coverage is 94.50%. Comparing base (76fbff7) to head (c0c3f91).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1548 +/- ## ======================================= Coverage 94.50% 94.50% ======================================= Files 28 28 Lines 5804 5804 Branches 1076 1159 +83 ======================================= Hits 5485 5485 Misses 193 193 Partials 126 126 ```

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[adam-urbanczyk]

Trivial change, merging