Count iOS safari-based browsers as safari

[Vasfed]

All apps on iOS must use safari engine by apple rules.
This PR will make safari-based iOS browsers count as safari thus improving stats

[dmfrancisco]

Thank you for your contribution 👍 It seems if we change this we can simplify the condition above this one too. The conditionals we have today match what is done at caniuse.com, when you import your Google Analytics. It would be nice if we kept it this way, but on the other hand these conditionals are a bit confusing and your changes seem to make sense!

Have you noticed differences in your browserslist-stats.json when using your version? When I use it with my own analytics I don't see any changes because my iOS traffic always shows up as Safari, Chrome or Safari (in-app).

[Vasfed]

@dmfrancisco you're right, conditions may be further simplified.

Found the reason, in original data items are like

[
    "iOS",
    "9.3.5",
    "YaBrowser",
    "9.0",
    "Yes",
    "5808"
  ]

Have you see any iOS app in stats? Looks like we may remove this completely and replace all iOS/iPhone/iPad/... with safari

[dmfrancisco]

This looks good 👍 Thank you again!