[bug] Incorrect version for Mobile Safari

[EECOLOR]

The test cases contain a few incorrect entries:

  - user_agent_string: 'Mozilla/5.0 (iPod touch; CPU iPhone OS 9_3_2 like Mac OS X) AppleWebKit/601.1.46 (KHTML, like Gecko) Mobile/13F69'
    family: 'Mobile Safari UI/WKWebView'
    major: '9'
    minor: '3'
    patch: '2'
  - user_agent_string: 'Mozilla/5.0 (iPhone; CPU iPhone OS 7_1_2 like Mac OS X) AppleWebKit/537.51.2 (KHTML, like Gecko) Mobile/11D257'
    family: 'Mobile Safari UI/WKWebView'
    major: '7'
    minor: '1'
    patch: '2'
  - user_agent_string: 'Mozilla/5.0 (iPad; U; CPU OS 4_3_2 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Mobile'
    family: 'Mobile Safari UI/WKWebView'
    major: '4'
    minor: '3'
    patch: '2'
- user_agent_string: 'Mozilla/5.0 (iPhone; CPU iPhone OS 10_0_2 like Mac OS X) AppleWebKit/602.1.50 (KHTML, like Gecko) AppleNews/608.0.1 Version/2.0.1'
    family: 'Mobile Safari UI/WKWebView'
    major: '10'
    minor: '0'
    patch: '2'

As you can see the OS version is used as the Safari version, which is incorrect. This causes problems with more modern ua strings.

Mozilla/5.0 (iPhone; CPU iPhone OS 12_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148 ManagedBrowser/20181024.1

Will be detected as Mobile Safari 12.4 which should have the IntersectionObserver. In reality however, this browser does not seem to have an IntersectionObserver, but it does not receive a polyfill (polyfill.io).

It would be best that ua version would be set to empty (unknown) in these cases. If you agree, I can attempt to create a pull request with these changes.

[commenthol]

@EECOLOR Could you please provide us with a PR?

[EECOLOR]

@commenthol #458

Closing this issue in favor of the created pull request.