(tribler) Fixes Update.ps1

[JPRuskin]

Description

This change excludes assets that match -debug_ from the GetLatest logic.

Motivation and Context

Tribler's releases now include debug executables, which were being picked up by the current logic.

How Has this Been Tested?

• Tested updating the package, successfully generated a new version

Types of changes

• [x] 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)~
• ~[ ] Migrated package (a package has been migrated from another repository)~

Checklist:

• [x] My code follows the code style of this repository.
• ~[ ] My change requires a change to documentation (this usually means the notes in the description of a package).~
• ~[ ] I have updated the documentation accordingly (this usually means the notes in the description of a package).~
• ~[ ] I have updated the package description and it is less than 4000 characters.~
• [x] All files are up to date with the latest Contributing Guidelines
• [ ] The added/modified package passed install/uninstall in the Chocolatey Test Environment(https://github.com/chocolatey-community/chocolatey-test-environment/). Note that we don't support the use of any other environment.
• [x] The changes only affect a single package (not including meta package).

[AppVeyorBot]

:white_check_mark: Package verification completed without issues. PR is now pending human review