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 } } } }}

```

Inizia dal punto di ingresso textDocument/definition e riproduci il report con lo snippet Lua dell'issue usando vim.lsp.buf.definition() di Neovim. Traccia il motivo per cui l'assegnazione della funzione locale produce intervalli sia per il nome della variabile sia per la parola chiave function; il lavoro è completato quando la richiesta restituisce solo la definizione della variabile locale.

Scritto dal modello di indicizzazione a partire dal testo della issue.