Allow the stop callback to be cancelled when already disconnected

#614 fixed the case were we would cancel the handshake in progress, but
it did not account for the race where we have not switched the state
to connecting yet because we have not obtained the lock. While I could
only get this to happen in a test its likely it possible in the
real world if the timing is exactly perfect

aioesphomeapi/reconnect_logic.py

@@ -316,7 +316,7 @@ async def start(self) -> None:
 
     async def stop(self) -> None:
         """Stop the connecting logic background task. Does not disconnect the client."""
-        if self._connection_state == ReconnectLogicState.CONNECTING:
+        if self._connection_state in NOT_YET_CONNECTED_STATES:
             # If we are still establishing a connection, we can safely
             # cancel the connect task here, otherwise we need to wait
             # for the connect task to finish so we can gracefully