fix(WindowLevelTool): attempt to set zero width color range

[Blackman99]

Context

When using mouse with WindowLevelTool. When the voiRange.upper is equal to or less than voiRange.lower, would cause attempt to set zero width color range in the console.

Changes & Results

Add a condition to ensure voiRange.upper is larger than voiRange.lower

Testing

• Before
  
• After
  

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: Ubuntu 23.10
• Node version: 20.10.0
• Browser: Chrome 120.0.6099.225

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[sedghi]

Thanks!