Setting vim.searchHighlightColor uses editor.findMatchHighlightBackground as default, but it is no longer available.

[nemeshnorbert]

Describe the bug
Unable to write to User Settings because editor.findMatchHighlightBackground is not a registered configuration.

To Reproduce

1. Run VS Code
2. Open developer tools
3. Behold

Expected behavior
No errors in the developer tools console.

Environment

• Extension (VsCodeVim) version:
  1.12.2

• VSCode version:
  Version: 1.40.2,
  Commit: f359dd69833dd8800b54d458f6d37ab7c78df520
  Date: 2019-11-25T14:54:40.719Z
  Electron: 6.1.5
  Chrome: 76.0.3809.146
  Node.js: 12.4.0
  V8: 7.6.303.31-electron.0
  OS: Linux x64 5.0.0-37-generic

• OS:
  Ubuntu 16.04.6 LTS

Additional context
My defualtSettings.json doesn't contain editor.findMatchHighlightBackground setting.

[J-Fields]

We're accessing a theme color like configuration. We should be using that theme color as the default.

[macintacos]

Just a note: this doesn't seem to have been noted in the README (it still says that it's default is editor.findMatchHighlightBackground). Almost opened another issue for this 🙂

[J-Fields]

@macintacos fixed, thanks for the heads up