`import` completion prints the path prefix twice

## **Description**
`import` completion prints the prefix twice
Some examples of the problem:
```
import 'package:package:vm_service/'
import 'package:vm_service/package:vm_service/vm_service.dart'
```

## **Steps to Reproduce**
Steps to reproduce the behavior:
1. Type `import 'package:ffi/`
2. Let the autocompletion window open
3. Select `package:ffi/ffi.dart` from the completion
4. Got this `import 'package:ffi/package:ffi/ffi.dart'`

**Expected behavior**
The reproducible steps should produce `import 'package:ffi/ffi.dart'`.
Just like the VS Code extension or any other Coc extensions.

## **Desktop:**
- Neovim version: 0.9.1

## **Output channel:**

Output

```
[dev-command]: register dev command
[sdk]: flutter command path => /opt/flutter/bin/flutter
[sdk]: dart sdk home => /opt/flutter/bin/cache/dart-sdk
[sdk]: analyzer path => /opt/flutter/bin/cache/dart-sdk/bin/snapshots/analysis_server.dart.snapshot
[sdk]: dart command path => /opt/flutter/bin/cache/dart-sdk/bin/dart
[fs]: executing command /opt/flutter/bin/cache/dart-sdk/bin/dart --version
[sdk]: dart version: v3.0.6
[lsp-server]: rightVersion true
[lsp-server]: analysis server ready!
[lsp-closing-labels]: register closing labels
[daemon]: got message: {
"event": "daemon.connected",
"params": {
"version": "0.6.1",
"pid": 103373
}
}
[daemon]: got message: {
"event": "daemon.logMessage",
"params": {
"level": "status",
"message": "Starting device daemon..."
}
}
[daemon]: got message: {
"id": 1
}
[daemon]: Message without event
[daemon]: got message: {
"event": "device.added",
"params": {
"id": "linux",
"name": "Linux",
"platform": "linux-x64",
"emulator": false,
"category": "desktop",
"platformType": "linux",
"ephemeral": false,
"emulatorId": null,
"sdk": "Arch Linux 6.4.7-arch1-2",
"capabilities": {
"hotReload": true,
"hotRestart": true,
"screenshot": false,
"fastStart": false,
"flutterExit": true,
"hardwareRendering": true,
"startPaused": true
}
}
}
[daemon]: New device: Linux
[daemon]: got message: {
"event": "device.added",
"params": {
"id": "chrome",
"name": "Chrome",
"platform": "web-javascript",
"emulator": false,
"category": "web",
"platformType": "web",
"ephemeral": false,
"emulatorId": null,
"sdk": "Google Chrome 115.0.5790.170",
"capabilities": {
"hotReload": true,
"hotRestart": true,
"screenshot": false,
"fastStart": false,
"flutterExit": false,
"hardwareRendering": true,
"startPaused": true
}
}
}
[daemon]: New device: Chrome
```