Remove unused JavascriptBindingFacts tests

[campersau]

Summary: Two test files where added in ae41e10 but this one wasn't referenced in the csproj file and the tests look very similar to the one from the other file.

Feel free to close this PR if this is wrong.

Changes:

• Removed unused test file

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Updated documentation

Checklist:

• Tested the code(if applicable)
• Commented my code
• Changed the documentation(if applicable)
• New files have a license disclaimer
• The formatting is consistent with the project (project supports .editorconfig)

[AppVeyorBot]

✅ Build CefSharp 83.4.2-CI3611 completed (commit 22d6724dc9 by @campersau)

[amaitland]

Thanks 👍 Likely safe to remove, will double check before merging.