[Bug] VSCode says overviewRulerColor should be a boolean

[drvictorvs]

Describe the bug
VSCode thinks overviewRulerColor should be a boolean. So, if you add the code that's used as an example in the extension's description, it will throw an error. Conversely, if you set it to a boolean, it won't.

To Reproduce
Basically, follow the example given in the extension's description, i.e.:

1. Open Setttings json
2. Add to it:

"gremlins.characters": {
  "000c" : {
    "zeroWidth": true,
    "description": "FORM FEED (FF)",
    "overviewRulerColor": "rgba(255,127,80,1)",
  }
}

VS Code will throw an error saying Incorrect type. Expected "boolean".

Expected behavior
No errors should be thrown.

Screenshots

Operating system:

• OS: Microsoft Windows
• Version: 10 - 21HS

Visual Studio Code:
Version: 1.74.2 (user setup)
Commit: e8a3071ea4344d9d48ef8a4df2c097372b0c5161
Date: 2022-12-20T10:29:14.590Z
Electron: 19.1.8
Chromium: 102.0.5005.167
Node.js: 16.14.2
V8: 10.2.154.15-electron.0
OS: Windows_NT x64 10.0.19044
Sandboxed: No

Gremlins extension:
Name: Gremlins tracker for Visual Studio Code
Id: nhoizey.gremlins
Description: Reveals some characters that can be harmful because they are invisible or looking like legitimate ones. Inspired by Sublime Gremlins.
Version: 0.26.0
Publisher: Nicolas Hoizey
VS Marketplace Link: https://marketplace.visualstudio.com/items?itemName=nhoizey.gremlins

Additional context
I have just installed the extension.