CommonClient: forget password when disconnecting (#3641)

* makes the kivy connect button do the same username forgetting that /connect does to fix an issue where losing connection would make you unable to connect to a different server

* extract duplicate code

* per request, adds handling on any disconnect to forget the saved password as to not leak it to other servers

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Co-authored-by: NewSoupVi <57900059+NewSoupVi@users.noreply.github.com>

CommonClient.py

@@ -61,6 +61,7 @@ class ClientCommandProcessor(CommandProcessor):
         if address:
             self.ctx.server_address = None
             self.ctx.username = None
+            self.ctx.password = None
         elif not self.ctx.server_address:
             self.output("Please specify an address.")
             return False
@@ -514,6 +515,7 @@ class CommonContext:
     async def shutdown(self):
         self.server_address = ""
         self.username = None
+        self.password = None
         self.cancel_autoreconnect()
         if self.server and not self.server.socket.closed:
             await self.server.socket.close()

kvui.py

@@ -596,6 +596,7 @@ class GameManager(App):
 
     def connect_button_action(self, button):
         self.ctx.username = None
+        self.ctx.password = None
         if self.ctx.server:
             async_start(self.ctx.disconnect())
         else: