cc-pdm-1.0.LICENSE false positive

### Description

When scanning:

https://github.com/mirror/busybox/blob/master/docs/draft-coar-cgi-v11-03-clean.html#L600

the result is cc-pdm-1.0 which is incorrect, as only 4 words are matched.

```
{
"path": "busybox-1.37.0/docs/draft-coar-cgi-v11-03-clean.html",
"type": "file",
"detected_license_expression": null,
"detected_license_expression_spdx": null,
"license_detections": [],
"license_clues": [
{
"license_expression": "cc-pdm-1.0",
"license_expression_spdx": "CC-PDM-1.0",
"from_file": "busybox-1.37.0/docs/draft-coar-cgi-v11-03-clean.html",
"start_line": 600,
"end_line": 600,
"matcher": "3-seq",
"score": 2.15,
"matched_length": 4,
"match_coverage": 2.15,
"rule_relevance": 100,
"rule_identifier": "cc-pdm-1.0.LICENSE",
"rule_url": "https://github.com/nexB/scancode-toolkit/tree/develop/src/licensedcode/data/licenses/cc-pdm-1.0.LICENSE"
}
],
"percentage_of_license_text": 0.04,
"scan_errors": []
},
```