fix(rotation): Only one CAMERA_MODIFIED event per rotation

[jbocce]

Context

Fixes: #819

Changes & Results

When setting the camera in StackViewport.setRotationGPU, do not fire a CAMERA_MODIFIED event because it is already being done so in setRotation.

Testing

See #819. However, here are some brief details here...

1. Launch the Stack API example.
2. Open the browser console and enter the following snippet of code that will log the event fired.

var viewport = cornerstone.getRenderingEngines()[0].getViewports()[0];
viewport.element.addEventListener(cornerstone.EVENTS.CAMERA_MODIFIED, (e) => console.log(e)); 

3. Click any of the rotate buttons in the example.
4. The console should log a single event for each rotation button click.

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.)

• I have run the yarn build:update-api to update the API documentation, and have
  committed the changes to this PR. (Read more here https://www.cornerstonejs.org/docs/contribute/update-api)

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: 16.14.0
• "Browser: Chrome 117.0.5938.152

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