fix invalidate stack if the next image is different PI

[medicalconnections]

Context

When the StackViewport's stack (series) has images that have different Photometric Interpretation, they would get rendered incorrectly. For example if there was 1 RGB image in a stack of Monochrome2 images, the RGB image would be rendered as if it is a Monochrome2 image.

Changes & Results

Invalidate the stack if we find a mismatch between the PI of the previous and the new image. This will force recreation of the VTK imageData object.

Testing

Tested with various US studies that had few RGB images next to MONOCHROME2.

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:
• [] "Node version:
• [] "Browser:

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