fix: line_of_sight_exists returns false if detector is not in world

modules/wave_survival/player_detector.cpp

@@ -73,6 +73,9 @@ void PlayerDetector::_notification(int what) {
 
 // check if there is geometry between detector and player
 bool PlayerDetector::line_of_sight_exists() const {
+	if (!is_inside_world()) {
+		return false;
+	}
 	PhysicsDirectSpaceState3D::RayParameters params{ this->ray_params };
 	params.from = get_global_position();
 	params.to = PlayerBody::get_singleton()->get_global_position();