Correctly check for nested tuple in map_func_over_tuple_of_tuples

[Michael-T-McCann]

fixes #499

[codecov[bot]]

Codecov Report

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

Comparison is base (13ef0a8) 94.79% compared to head (eebda28) 94.77%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #500 +/- ## ========================================== - Coverage 94.79% 94.77% -0.02% ========================================== Files 91 91 Lines 5640 5641 +1 ========================================== Hits 5346 5346 - Misses 294 295 +1 ``` | [Flag](https://app.codecov.io/gh/lanl/scico/pull/500/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=lanl) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/lanl/scico/pull/500/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=lanl) | `94.77% <100.00%> (-0.02%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=lanl#carryforward-flags-in-the-pull-request-comment) to find out more.

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