"harper_ls::backend: Settings must be an object." when lsp server is used in kate

**Describe the bug**
`harper-ls --stdio` fails when ran inside kate

**To Reproduce**
Steps to reproduce the behavior:
1. Open Kate
2. Go to Settings -> Configure Kate -> LSP Client -> User Server Settings
3. Paste in ```{
"servers": {
"markdown": {
"command": ["harper-ls","--stdio"],
"rootIndicatorFileNames": [".git",".marksman.toml"],
"url": "https://writewithharper.com",
"highlightingModeRegex": "^Markdown$"
}
}
}```
4. Open a markdown file and accept the prompt

**Expected behavior**
Harper should load as the default language server for markdown with this configuration, it errors out instead

**Screenshots**

**Platform**
Kate LSP Client Support and likely KDevelop as well

Start by reproducing the failure with `harper-ls --stdio` using the supplied Kate LSP Client User Server Settings and a Markdown file. Trace how the server handles this configuration at startup; done means Kate can load Harper as the default Markdown language server without the “Settings must be an object” error.

Written by the indexing model from the issue text.