Adding global definitions always indents with 4 spaces

### Which OS are you using?

Windows

### Expected Behaviour

When I use the VSCode function to define a variable as allowed global, it should re-use the formatting of the existing file (luarc.json) when adding it.

### Actual Behaviour

It always uses 4 spaces, instead of the 2 the file uses.

### Reproduction steps

1. Have a global in your file
2. Have a .luarc.json file in your project
3. Have the LSP complain about it being global
4. Use the VSC action to mark it as defined

### Additional Notes


### Log

_No response_

Start by tracing the VSCode action that adds an allowed global to .luarc.json, then inspect how the existing file's indentation is read or preserved. Reproduce the issue with a file using two-space indentation and confirm that marking a global as defined keeps that formatting rather than inserting four spaces.

Written by the indexing model from the issue text.