Babelstone IDS not detected by scancode toolkit

### Description

Scancode toolkit is not able to produce a license match for `BabelstoneIDS`. This license file is used as a reference in google licenseclassifier v2.
Link to file: https://github.com/google/licenseclassifier/blob/main/v2/licenses/BabelstoneIDS.txt

### How To Reproduce

This exact commands were
```sh
scancode -l --license-text --license-text-diagnostics Desktop/licenseclassifier/v2/licenses/ --json-pp Desktop/scan_result.json
```

This is the output for BabelstoneIDS.txt
```json
{
"path": "licenses/BabelstoneIDS.txt",
"type": "file",
"licenses": [],
"license_expressions": [],
"percentage_of_license_text": 0,
"copyrights": [],
"holders": [],
"authors": [],
"scan_errors": []
},
```

### System configuration

* Operating System - Ubuntu 20.04.2 LTS
* ScanCode version - 21.6.7
* Python version - 3.8.10