WPF - Fix Chinese IME character Composition issue

[yeyezizhi]

Issue:

#1262

Summary:

• This pr is based on pull request WPF - IME Fix Korean character emitting issue. I find out that only ImeNative.LANG_KOREAN is handled. So I add ImeNative.LANG_CHINESE in the if statement.

Changes:

• CefSharp.Wpf.Experimental.WpfImeKeyboardHandler.cs is modified.
  from

  if (languageCodeId == ImeNative.LANG_KOREAN) {...}

  to

  if (languageCodeId == ImeNative.LANG_KOREAN || languageCodeId == ImeNative.LANG_CHINESE) {...}

How Has This Been Tested?

• I have tested Chinese IME on windows 10, version 2004, and it works well.

Screenshots (if appropriate):

Types of changes

• 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)
• Updated documentation

Checklist:

• Tested the code(if applicable)
• Commented my code
• Changed the documentation(if applicable)
• New files have a license disclaimer
• The formatting is consistent with the project (project supports .editorconfig)

[AppVeyorBot]

✅ Build CefSharp 83.4.0-CI3568 completed (commit 6ea7906e73 by @yeyezizhi)

[amaitland]

Please add a comment to #1262 detailing your proposed change so others using the feature are kept up to date. Please include as much detail as possible.

[amaitland]

As I have no means of testing this I'm merging as is, it will be included in the 83.4.x. release.

Please make sure to update #1262 with details.