Add another case where cindent is correct

When calling a function, or anything with nested parens, default to cindent's indent. The least error-prone way I could think of identifying this is to look for a line that ends with a ',', as well as a non-zero number of any character except parens before the comma, and then an open paren.

This will overlap with the previous rule accounting for function definitions, but that should be fine because it is also using cindent.