fix(SplineROITool): Do not reset the cursor for the SplineROITool because it was never set in the first place.

[jbocce]

Context

When using the SplineROITool or any of its extensions (e.g. SplineContourSegmentationTool) immediately after using a tool that uses/sets cursor:none (e.g. EllipticalROITool), the mouse cursor disappears as soon as the last point of the spline is placed.

Changes & Results

The SplineROITool does not set a cursor when it is first applied, so there is no reason to reset the cursor when the tool is finished being applied. Thus the code was altered to no longer reset the cursor for the SplineROITool.

Testing

1. Apply a tool (e.g. EllipticalROITool)
2. Switch to and apply the SplineROITool.
3. Ensure that the mouse cursor does not disappear.

Checklist

PR

• My Pull Request title is descriptive, accurate and follows the
  semantic-release format and guidelines.

Code

• My code has been well-documented (function documentation, inline comments,
  etc.)

Public Documentation Updates

• The documentation page has been updated as necessary for any public API
  additions or removals.

Tested Environment

• "OS: Windows 11
• "Node version: 23.9.0
• "Browser: Chrome 142.0.7444.60