Indentation when formatting off for values inside square brackets

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### How are you using the lua-language-server?

Other (Defold's built-in text editor)

### Which OS are you using?

Linux (also happens on other platforms)

### What is the issue affecting?

Formatting

### Expected Behaviour

Hello, thank you for LuaLS!

There is a small issue that we have found when formatting a Lua file and indentation;

```lua
local v = t[
key(1)
]
```

### Actual Behaviour

This is how the formatter leaves it;

```lua
local v = t[
key(1)
]
```

### Reproduction steps

https://github.com/defold/defold/pull/12995

1. In the Defold Editor's text editor, in a Lua script file, type
```lua
local v = t[
key(1)
]
```

2. Run the document formatter function with `Alt+Shift+F` or from the top menu `Edit > Format Document/Selection`
3. `key(1)` falls back to previous column

### Additional Notes

_No response_

### Log File

_No response_

Reproduce the issue in Defold's built-in text editor using the Lua snippet and the Format Document command, then trace the LuaLS formatting path that handles expressions inside square brackets. Done means formatting preserves the indentation before key(1), including in the linked Defold reproduction.

Written by the indexing model from the issue text.