Fixed continuous list palettes in get_scales_list

[bvancil]

I am new to pull requests, so please let me know if this doesn't meet your standards or you have any questions.

This addresses the issue #1 by swapping out the reference from "pal_object", which is not callable as a function, to "palette_func", which is the function defined in the lexical closure.

[bvancil]

I wonder if the ellipsis (...) would be more useful applied to func instead of palette_func.