Improve a bit virtuoso detection (#2547)
Improve a bit virtuoso detection (#2547)

- Optimize the `url` regexp
- simplify the `Server` one
AliasIO/wappalyzer,AliasIO/wappalyzer,WPO-Foundation/Wappalyzer,WPO-Foundation/Wappalyzer,WPO-Foundation/Wappalyzer