fix: disallow users from bypassing shadowed login

src/Discord.Net.Rest/BaseDiscordClient.cs

@@ -65,7 +65,7 @@ namespace Discord.Rest
             }
             finally { _stateLock.Release(); }
         }
-        private async Task LoginInternalAsync(TokenType tokenType, string token, bool validateToken)
+        internal virtual async Task LoginInternalAsync(TokenType tokenType, string token, bool validateToken)
         {
             if (_isFirstLogin)
             {
@@ -118,7 +118,7 @@ namespace Discord.Rest
             }
             finally { _stateLock.Release(); }
         }
-        private async Task LogoutInternalAsync()
+        internal virtual async Task LogoutInternalAsync()
         {
             if (LoginState == LoginState.LoggedOut) return;
             LoginState = LoginState.LoggingOut;

src/Discord.Net.WebSocket/DiscordSocketRestClient.cs

@@ -10,7 +10,11 @@ namespace Discord.WebSocket
 
         public new Task LoginAsync(TokenType tokenType, string token, bool validateToken = true)
             => throw new NotSupportedException("The Socket REST wrapper cannot be used to log in or out.");
+        internal override Task LoginInternalAsync(TokenType tokenType, string token, bool validateToken)
+            => throw new NotSupportedException("The Socket REST wrapper cannot be used to log in or out.");
         public new Task LogoutAsync()
             => throw new NotSupportedException("The Socket REST wrapper cannot be used to log in or out.");
+        internal override Task LogoutInternalAsync()
+            => throw new NotSupportedException("The Socket REST wrapper cannot be used to log in or out.");
     }
 }