removed unused condition (#1769)

nav2_dwb_controller/dwb_critics/src/twirling.cpp

@@ -39,10 +39,6 @@ namespace dwb_critics
 {
 void TwirlingCritic::onInit()
 {
-  if (!nh_->has_parameter(dwb_plugin_name_ + "." + name_ + ".scale")) {
-    nh_->declare_parameter(dwb_plugin_name_ + "." + name_ + ".scale", rclcpp::ParameterValue(0.0));
-  }
-
   // Scale is set to 0 by default, so if it was not set otherwise, set to 0
   nh_->get_parameter(dwb_plugin_name_ + "." + name_ + ".scale", scale_);
 }