Accounting for light travel time in starry model

[taylorbell57]

So Eric Agol pointed out to Mark Hammond who pointed out to me that by default starry doesn't account for light travel time. Back before version 1.0 I knew starryhad accounted for this but I didn't check the newer version, and apparently with v>=1.0 it doesn't by default. This tiny little PR flips that switch within starry to account for light travel time

[codecov-commenter]

Codecov Report

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

Comparison is base (7c6728a) 57.61% compared to head (fc9c444) 57.60%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #587 +/- ## ========================================== - Coverage 57.61% 57.60% -0.01% ========================================== Files 96 96 Lines 11553 11553 ========================================== - Hits 6656 6655 -1 - Misses 4897 4898 +1 ```

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