Theme inheritance

[funnym0nk3y]

Please select if your request is either something new or an enhancement

• [x] Enhancement of an existing Feature.
• [ ] Request of a new feature.

Please select the area your request applies to. (Multiple selections are Possible. You can leave blank if you're not sure.)

• [ ] Workspace - VSCode workspace, vaults, Intellisense/autocomplete, Dendron settings
• [ ] Lookup - Dendron's Lookup Command
• [x] Views - Dendron Preview, Tree View, Side Panels in the UI
• [ ] Schema - Dendron Schemas
• [ ] Pod - Data import from / export to Dendron
• [ ] Publish - External Site Publish
• [ ] Markdown - Markdown features, such as syntax support and features

Rough desciption

When using a custom theme the default dendron theme is inherited. As already roughly discussed in #1937 this is the issue for vscode theme inheritance when using a cutom theme.

[Harshita-mindfire]

Thanks for the suggestion @funnym0nk3y.