Fix tunnelProtocol context key always resolving to https on focus

[UditDewan]

In the Ports view, onFocusChanged sets the tunnelProtocol context key with a ternary whose branches are both TunnelProtocol.Https, so the key reports https for every focused tunnel regardless of its actual protocol:

this.tunnelProtocolContext.set(item.protocol === TunnelProtocol.Https ? TunnelProtocol.Https : TunnelProtocol.Https);

This looks like a typo introduced in a414bf2 when the protocol handling was reworked. The context menu path (onContextMenu) sets the key from node.protocol directly, so right-click menus behave, but anything that reads tunnelProtocol after a plain focus or selection change (keybinding and menu when clauses, the HTTP/HTTPS toggle state in the Change Port Protocol submenu) sees https even for HTTP tunnels.

The fix makes the else branch return TunnelProtocol.Http, which matches the key's declared default and the intent of the original normalization.

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[alexr00]

Thank you for the PR