App does not remember port when switching protocols

[gorkapernas]

Description:

Currently when selecting a specific port for a certain protocol, if the user changes the protocol and goes back to the previous one, the app will not remember the port selected initially, the app always resets the ports to the default one when switching protocols.

Expected result:

The app should remember the port selected by the user.

Expected result:

1. Install version 2.6.3 o latest beta 2.7.0.
2. Login.
3. Select any port for e.g. WireGuard.
4. Change the protocol to OpenVPN and back to WireGuard (same happens the other way around).
5. Observe that the port number is reset to default.

Environment:

IVPN: v2.6.3, v2.7.0
Devices: iPhone XR iOS 16.2

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This issue was initially reported on #269 (comment)

[gorkapernas]

This also happens when switching between VMESS/UDP and VMESS/TCP, TF version 2.11.0 (11).