duplicate field error when setting a field to a function in an if/else

還沒有人認領這個 Issue。

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

Visual Studio Code Extension (sumneko.lua)

### Which OS are you using?

Windows

### What is the issue affecting?

Diagnostics/Syntax Checking

### Expected Behaviour

No duplicate field error

### Actual Behaviour

``` local t = {}
if x then
t.s = function() return 1 end
else
t.s = function() return 2 end
end
```
This is not a duplicate field and should not be an error

### Reproduction steps

``` local t = {}
if x then
t.s = function() return 1 end
else
t.s = function() return 2 end
end
```
Write that into the editor. See error as indicated above.

### Additional Notes

v3.6.4

### Log File

[file_c%3A_Users_User_AppData_Roaming_Factorio_mods_space-exploration.log](https://github.com/sumneko/lua-language-server/files/10316714/file_c.3A_Users_User_AppData_Roaming_Factorio_mods_space-exploration.log)

使用提供的條件指派程式碼片段在 Visual Studio Code 擴充功能中重現該診斷，重點關注 Diagnostics/Syntax Checking 進入點。追蹤為什麼兩個分支指派會被回報為重複欄位，然後驗證同一個範例不再產生該錯誤。

由索引模型根據 Issue 內容生成。