Fix start_navigate_to()

Author: sktometometo

spot_wrapper/wrapper.py

@@ -2556,7 +2556,7 @@ def _start_navigate_to(self, target_waypoint_id) -> typing.Tuple[bool, str, str]
         self._lease = self._lease_wallet.advance()
         self._lease_keepalive = LeaseKeepAlive(self._lease_client)
 
-        if self._state_navigate_to_valid:
+        if not self._state_navigate_to_valid:
             return False, "Navigation is canceled", "preempted"
 
         status = self._graph_nav_client.navigation_feedback(nav_to_cmd_id)