fix(scoop-info): Fix error message when manifest is not found

[quotidian-ennui]

Description

Fixes #4928.

Abort message no longer references the last bucket searched via Find-Manifest

Motivation and Context

Fixes #4928

How Has This Been Tested?

This is an edge case abort message, and there appear to be no tests that use the string literal Could not find manifest which suggests the text is never explicitly matched against during test execution.

$ find . -name "*.ps1" -exec grep -iH "could not find manifest" {} \;
./libexec/scoop-home.ps1:        abort "Could not find manifest for '$app'."
./libexec/scoop-info.ps1:    abort "Could not find manifest for '$(show_app $app)' in any known buckets."

My assumption here is that the tests should pass, sadly I don't actually have a powershell build environment, and I wouldn't really know how to start building one to include BuildHelpers and other PS modules referenced in test/bin/test.ps1

Checklist:

• I have read the Contributing Guide.
• I have ensured that I am targeting the develop branch.
• I have updated the documentation accordingly. Documentation change not required.
• I have updated the tests accordingly.
• I have added an entry in the CHANGELOG.