LGPL 3 false positive (should be LGPL 2 or 2.1)

### Description

https://github.com/KDE/libqzeitgeist/blob/master/src/logbrowser.cpp

is recognized as LGPL 3:

```
"license_detections": [
{
"license_expression": "lgpl-3.0",
"license_expression_spdx": "LGPL-3.0-only",
"matches": [
{
"license_expression": "lgpl-3.0",
"license_expression_spdx": "LGPL-3.0-only",
"from_file": "logbrowser.cpp",
"start_line": 4,
"end_line": 16,
"matcher": "3-seq",
"score": 88.68,
"matched_length": 94,
"match_coverage": 88.68,
"rule_relevance": 100,
"rule_identifier": "lgpl-3.0_16.RULE",
"rule_url": "https://github.com/nexB/scancode-toolkit/tree/develop/src/licensedcode/data/rules/lgpl-3.0_16.RULE"
}
],
"identifier": "lgpl_3_0-129dffd6-23d4-eb21-f89e-b5145e4553c9"
}
],

```

What absolutely baffles me is that the exact same license header is used in #4994 where it is not recognized as LGPL 3.