fix(lsp): inlay hints span issue with user config scripts (#15071)

# Description

Fixes this:

![image](https://github.com/user-attachments/assets/98b523dd-df30-4e85-b069-20aaad0d9bf5)

# User-Facing Changes

# Tests + Formatting

I can't figure out how to test this atm.
Happy to do it if someone show me some hints how.

# After Submitting

crates/nu-lsp/src/hints.rs

@@ -160,6 +160,7 @@ impl LanguageServer {
     }
 }
 
+/// TODO: test for files loaded as user config
 #[cfg(test)]
 mod tests {
     use crate::path_to_uri;