Fix `Should-Throw`/`Should -Throw` to handle expected message with escaped wildcard

[johlju]

PR Summary

This target v6. This resolves #2558 so that when the expected message containing escaped wildcard is output is removes the escaped character so it shows the correct expected message that differ from the actual value.

Fix #2558

PR Checklist

• [x] PR has meaningful title
• [x] Summary describes changes
• [x] PR is ready to be merged
  • If not, use the arrow next to Create Pull Request to mark it as a draft. PR can be marked Ready for review when it's ready.
• [x] Tests are added/update (if required)
• [ ] Documentation is updated/added (if required)

[johlju]

@fflaten this passes the tests now. It seemed that fomatOnSave was on in this repos .vscode file so it has formated some lines without me asking it. 🙂