[BUG] - Fix embedded lists for ap_fit guess #206
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Short version: the fixed line ended up with an extra layer of embedded lists which led to downstream problems.
The longer version (why it's a problem):
In practice, we never bound the aperiodic fits, but in theory one could, by update
_ap_bounds. However - if one tried to do this, then the fitting actually gets kicked to a different approach, which then checks that the guess parameters are 1d. This would then fail, because the embedded list made them 2d. This PR fixes that.Note that this change doesn't change anything that happens in standard usage - but will make it possible to add
_ap_bounds, in which case what happens in the fitting is slightly different.