[Bug] PlanarFreehandROITool fires unnecessary `ANNOTATION_MODIFIED` events when an open contour is drawn

[ScottShingler]

Describe the Bug

Creating an open contour using the PlanarFreehandROITool on a StackViewport will cause extraneous ANNOTATION_MODIFIED events to be triggered. This can be observed by setting up an event listener that logs to console:

eventTarget.addEventListener(
    csToolsEnums.Events.ANNOTATION_MODIFIED,
    (event) => {
        console.log(`ANNOTATION_MODIFIED: ${event.detail.viewportId} ${event.detail.annotation.annotationUID} ${event.detail.changeType}`);
    }
);

This becomes a crippling issue when you have multiple viewports and need to force the other viewports to render so that the annotation is updated. Because of the extraneous ANNOTATION_MODIFIED event, it ends up causing an infinite feedback loop. I have created a repro that demonstrates this: cornerstone-annotation-spam-repro

This behaviour seems to have only started after #1372 was merged in.

Steps to Reproduce

1. Draw an open contour on an image in a StackViewport

The current behavior

Extra ANNOTATION_MODIFIED events are triggered when the annotation is completed.

The expected behavior

A single ANNOTATION_MODIFIED event should be triggered once when the annotation is completed.

OS

Windows 11

Node version

18.20.3

Browser

Edge 129.0.2792.52 (Official build) (64-bit)