fix/forgotten comma in `CircularArc.to_vtk`

[germa89]

Hi

Recent update in Pyvista raised that there is a forgotten comma in the method CircularArc.to_vtk (https://github.com/pyvista/pyiges/blob/1df9a8d6004e5f6d8aa37638706ef41d31a08f53/pyiges/geometry.py#L633 ).

I'm not sure why now it is highlighted.

[germa89]

I created the PR in my own fork:

See https://github.com/pyvista/pyiges/pull/21

[germa89]

I'm trying to find out why that error is raised now:

• I checked the pyiges offending line and it was written 17 months ago: https://github.com/pyvista/pyiges/blame/1df9a8d6004e5f6d8aa37638706ef41d31a08f53/pyiges/geometry.py#L633

• I check also the method pv.CircularArc the line where it checks the inputs and it was also written long ago: https://github.com/pyvista/pyvista/blame/cb31edb71be38aac3cb601917f2f26813b1fce9a/pyvista/utilities/geometric_objects.py#L950

• I also checked if the function has been modified, and it hasn't been recently: https://github.com/pyvista/pyvista/blame/cb31edb71be38aac3cb601917f2f26813b1fce9a/pyvista/utilities/errors.py#L328-L335

I guess I'm missing something here.

Anyway, the proposed PR solves the issue.

[akaszynski]

I'm trying to find out why that error is raised now:

• I checked the pyiges offending line and it was written 17 months ago: https://github.com/pyvista/pyiges/blame/1df9a8d6004e5f6d8aa37638706ef41d31a08f53/pyiges/geometry.py#L633
• I check also the method pv.CircularArc the line where it checks the inputs and it was also written long ago: https://github.com/pyvista/pyvista/blame/cb31edb71be38aac3cb601917f2f26813b1fce9a/pyvista/utilities/geometric_objects.py#L950
• I also checked if the function has been modified, and it hasn't been recently: https://github.com/pyvista/pyvista/blame/cb31edb71be38aac3cb601917f2f26813b1fce9a/pyvista/utilities/errors.py#L328-L335

I guess I'm missing something here.

Anyway, the proposed PR solves the issue.

The change was pyvista enforces inputs much more strictly in https://github.com/pyvista/pyvista/pull/1971