Fix get default session (#226)

Author: Surendra9123

pyrogram/methods/auth/disconnect.py

@@ -37,5 +37,6 @@ async def disconnect(
 
         await self.session.stop()
         await self.storage.close()
+        self.session = None
         self.is_connected = False
         self._is_server_time_synced = False

pyrogram/methods/auth/send_code.py

@@ -109,6 +109,11 @@ async def send_code(
                 await self.storage.server_address(dc_option.ip_address)
                 await self.storage.port(dc_option.port)
 
-                self.session = await self.get_session(temporary=True, export_authorization=False)
+                self.session = await self.get_session(
+                     server_address=await self.storage.server_address(),
+                     port=await self.storage.port(),
+                     export_authorization=False,
+                     temporary=True
+                )
             else:
                 return types.SentCode._parse(r)

pyrogram/methods/auth/sign_in_bot.py

@@ -64,7 +64,13 @@ async def sign_in_bot(
                 await self.storage.server_address(dc_option.ip_address)
                 await self.storage.port(dc_option.port)
 
-                self.session = await self.get_session(temporary=True, export_authorization=False)
+                self.session = await self.get_session(
+                     server_address=await self.storage.server_address(),
+                     port=await self.storage.port(),
+                     export_authorization=False,
+                     temporary=True
+                )
+
             else:
                 await self.storage.user_id(r.user.id)
                 await self.storage.is_bot(True)