fix: RequestsException with multi points layers and TSP option selected in point layer proc

[merydian]

Input input_points list was appended by lists of points not the points themselves.

[koebi]

Do I read correctly that we're basically going from a list of lists (i.e. [ [], [], [] ]) to a list of list (i.e. [ [ ] ])?

[merydian]

Yes, exactly.