Add can_setindex for ChainRules OneElement

[codecov[bot]]

Codecov Report

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

Project coverage is 71.22%. Comparing base (f3f07b6) to head (061c0c9). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #432 +/- ## ========================================== + Coverage 71.16% 71.22% +0.05% ========================================== Files 8 9 +1 Lines 548 549 +1 ========================================== + Hits 390 391 +1 Misses 158 158 ```

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