Fix JSONPathTester not working with root level arrays

[wiewiur667]

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• New feature or enhancement
• UI change (please include screenshot!)
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Internationalization and localization
• Other (please describe):

What is the current behavior?

JSONPathTester is not working with root level arrays like:

[
 {"foo": 1},
 {"foo": 2},
]

Issue Number: N/A

What is the new behavior?

Changed object type from JObject to more generic JToken to parse root level arrays.
Now $[0].foo will not crash tester.

Quality check

Before creating this PR:

• Did you follow the code style guideline as described in CONTRIBUTING.md
• Did you build the app and test your changes?
• Did you check for accessibility? On Windows, you can use Accessibility Insights for this.
• Did you verify that the change work in Release build configuration
• Did you verify that all unit tests pass
• If necessary and if possible, did you verify your changes on:
  • Windows
  • macOS
  • Linux

[veler]

Hello,
Thank you very much for this proposal! Works like a charm!