GH-450 Browser - Fix for authority to make sure we get the port.

[jamesmontemagno]

Description of Change

Make sure we use Authority. Via: https://stackoverflow.com/questions/2142910/whats-the-difference-between-uri-host-and-uri-authority

Authority = Host Name + Port No

And if URL protocol is using a default port, say port 80 for http URL, then only in that case Authority = Host Name (Port No is assumed to be 80),

Whereas Host Name is either Domain Name or I.P Address

Example:

http://www.example.com/

Authority = www.example.com
Host Name = www.example.com

http://255.255.255.255:8080/

Authority = 255.255.255.255:8080
Host Name = 255.255.255.255

Bugs Fixed

• Related to issue Browser.OpenAsync to uri with port number #450

Provide links to issues here. Ensure that a GitHub issue was created for your feature or bug fix before sending PR.

PR Checklist

• Has tests (if omitted, state reason in description)
• Has samples (if omitted, state reason in description)
• Rebased on top of master at time of PR
• Changes adhere to coding standard
• Updated documentation (see walkthrough)

[dend]

✅ Validation status: passed

File	Status	Preview URL	Details
Tests/Browser_Tests.cs	✅Succeeded
Xamarin.Essentials/Browser/Browser.shared.cs	✅Succeeded

For more details, please refer to the build report.

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