Two definitions for local function variables

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

NeoVim

### Which OS are you using?

Linux

### What is the issue affecting?

Other

### Expected Behaviour

Using vim.lsp.buf.definition() to go to the definition of a local function variable (assigned with the `=` operator), should give only a single definition at the local variable name.

### Actual Behaviour

Using vim.lsp.buf.definition() to go to the definition of a local function variable (assigned with the `=` operator), gives two definitions on the same line. One is located at the variable name and the other is located at the beginning of the function key word.

### Reproduction steps

1. Create a lua file with the following content:
```lua
local m = function() print "hello world" end

m()
```
2. Move the cursor on the `m()` function call
3. Execute the neovim command `:lua vim.lsp.buf.definition()`

### Additional Notes

_No response_

### Log File

```
[DEBUG][2023-12-16 17:31:59] .../lua/vim/lsp.lua:1391 "LSP[lua_ls]" "client.request" 1 "textDocument/definition" { position = { character = 0, line = 2 }, textDocument = { uri = "file:///home/tobias/.config/nvim/test.lua" }} 147
[DEBUG][2023-12-16 17:31:59] .../vim/lsp/rpc.lua:284 "rpc.send" { id = 1559, jsonrpc = "2.0", method = "textDocument/definition", params = { position = { character = 0, line = 2 }, textDocument = { uri = "file:///home/tobias/.config/nvim/test.lua" } }}
[DEBUG][2023-12-16 17:31:59] .../vim/lsp/rpc.lua:387 "rpc.receive" { id = 1559, jsonrpc = "2.0", result = { { originSelectionRange = { ["end"] = { character = 1, line = 2 }, start = { character = 0, line = 2 } }, targetRange = { ["end"] = { character = 7, line = 0 }, start = { character = 6, line = 0 } }, targetSelectionRange = { ["end"] = { character = 7, line = 0 }, start = { character = 6, line = 0 } }, targetUri = "file:///home/tobias/.config/nvim/test.lua" }, { originSelectionRange = { ["end"] = { character = 1, line = 2 }, start = { character = 0, line = 2 } }, targetRange = { ["end"] = { character = 44, line = 0 }, start = { character = 10, line = 0 } }, targetSelectionRange = { ["end"] = { character = 44, line = 0 }, start = { character = 10, line = 0 } }, targetUri = "file:///home/tobias/.config/nvim/test.lua" } }}
[DEBUG][2023-12-16 17:32:02] .../lua/vim/lsp.lua:1391 "LSP[lua_ls]" "client.request" 1 "textDocument/codeLens" { textDocument = { uri = "file:///home/tobias/.config/nvim/test.lua" }} 147
[DEBUG][2023-12-16 17:32:02] .../vim/lsp/rpc.lua:284 "rpc.send" { id = 1560, jsonrpc = "2.0", method = "textDocument/codeLens", params = { textDocument = { uri = "file:///home/tobias/.config/nvim/test.lua" } }}
[DEBUG][2023-12-16 17:32:02] .../vim/lsp/rpc.lua:387 "rpc.receive" { id = 1560, jsonrpc = "2.0"}
[DEBUG][2023-12-16 17:32:02] .../lua/vim/lsp.lua:1391 "LSP[lua_ls]" "client.request" 1 "textDocument/documentHighlight" { position = { character = 0, line = 2 }, textDocument = { uri = "file:///home/tobias/.config/nvim/test.lua" }} 147
[DEBUG][2023-12-16 17:32:02] .../vim/lsp/rpc.lua:284 "rpc.send" { id = 1561, jsonrpc = "2.0", method = "textDocument/documentHighlight", params = { position = { character = 0, line = 2 }, textDocument = { uri = "file:///home/tobias/.config/nvim/test.lua" } }}
[DEBUG][2023-12-16 17:32:02] .../vim/lsp/rpc.lua:387 "rpc.receive" { id = 1561, jsonrpc = "2.0", result = { { kind = 3, range = { ["end"] = { character = 7, line = 0 }, start = { character = 6, line = 0 } } }, { kind = 2, range = { ["end"] = { character = 1, line = 2 }, start = { character = 0, line = 2 } } } }}
[TRACE][2023-12-16 17:32:02] ...lsp/handlers.lua:618 "default_handler" "textDocument/documentHighlight" { ctx = '{\n bufnr = 147,\n client_id = 1,\n method = "textDocument/documentHighlight",\n params = {\n position = {\n character = 0,\n line = 2\n },\n textDocument = {\n uri = "file:///home/tobias/.config/nvim/test.lua"\n }\n }\n}', result = { { kind = 3, range = { ["end"] = { character = 7, line = 0 }, start = { character = 6, line = 0 } } }, { kind = 2, range = { ["end"] = { character = 1, line = 2 }, start = { character = 0, line = 2 } } } }}

```

Commencez au point d’entrée textDocument/definition et reproduisez le rapport avec l’extrait Lua de l’issue en utilisant vim.lsp.buf.definition() de Neovim. Suivez pourquoi l’affectation de la fonction locale produit des plages à la fois pour le nom de la variable et pour le mot-clé function ; le travail est terminé lorsque la requête ne renvoie que la définition de la variable locale.

Rédigé par le modèle d'indexation à partir du texte de l'issue.