Wavelet fix

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 40.33%. Comparing base (c072bcc) to head (2329f94). Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
pixell/wavelets.py	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #272 +/- ## ========================================== - Coverage 40.34% 40.33% -0.01% ========================================== Files 28 28 Lines 9838 9839 +1 ========================================== Hits 3969 3969 - Misses 5869 5870 +1 ``` | [Flag](https://app.codecov.io/gh/simonsobs/pixell/pull/272/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=simonsobs) | Coverage Δ | | |---|---|---| | [](https://app.codecov.io/gh/simonsobs/pixell/pull/272/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=simonsobs) | `40.33% <0.00%> (-0.01%)` | :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=simonsobs#carryforward-flags-in-the-pull-request-comment) to find out more.

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