When drawing a second annotation, annotation type defaults to Spline eventhough the UI shows Polyline is selected

[lydiang]

Environment

• OS: Windows 10
• Cell Locator: 0.1.0.2020-05-21

Description

Use Case: I want to create many annotation of type "Polygon" I draw my first "Polygon" and all is well

I add a new curve and since seeing that "Polygon" selected I start drawing

However, the application is actually in "Spline" mode

Expected behavior

The application behavior and the annotation type radio button indicator are consistent

How to Reproduce

(see description)

1. Start the application
2. Then run '...'
3. An error occurs.

[allemangD]

Linked to #188 by mistake - I've removed that so this should keep open even if #188 is merged.