Fix that ViFindBrace doesn't search for brace when current char is not a brace

[sharpchen]

PR Summary

Vi searches right pair of first left brace, or first right brace when current char is not a brace. This pr added this functionality.

After the update, ViGotoBrace should work like this(of course this will also affect other methods such as ViDeleteBrace):

PR Checklist

• PR has a meaningful title
  • Use the present tense and imperative mood when describing your changes
• Summarized changes
• Make sure you've added one or more new tests
• Make sure you've tested these changes in terminals that PowerShell is commonly used in (i.e. conhost.exe, Windows Terminal, Visual Studio Code Integrated Terminal, etc.)
• User-facing changes
  • Not Applicable
  • OR
  • Documentation needed at PowerShell-Docs
    • Doc Issue filed:

Microsoft Reviewers: Open in CodeFlow