Pyvista: Camera is resetting in add_point_labels

[rodrigomologni]

add_point_labels is resetting the camera. I fixed the bug including reset_camera=False in self.add_mesh, at line 3106 of plotting.py.

[banesullivan]

@rodrigomologni, thanks for point this out - good find!

[banesullivan]

We do want the camera to reset by default, so I will add reset_camera=None to add_point_labels arguments which we'll pass to that add_mesh call. If you don't want it to reset, then as a user you'll need to pass reset_camera=False.

See #805

[rodrigomologni]

@banesullivan I who thank you! :-)