define default port const for gemini socket client

src/app/browser/main/tab/page.cpp

@@ -283,7 +283,7 @@ void Page::navigation_reload(
             g_uri_to_string(
                 uri
             ),
-            1965, // default port @TODO
+            Socket::Client::Gemini::DEFAULT_PORT,
             [this](const Glib::RefPtr<Gio::AsyncResult> & RESULT)
             {
                 // Update

src/app/browser/main/tab/page.hpp

@@ -96,6 +96,8 @@ namespace app::browser::main::tab
 
                         struct Gemini
                         {
+                            static const int DEFAULT_PORT = 1965;
+
                             static Glib::RefPtr<Gio::SocketClient> create();
                         };
                 };