fix: Add global frame ID to UTM path poses. (#90)

This fixes an issue with visualization of the UTM path in Foxglove Studio which requires that the path frame_id match all the pose frame_ids.

Author: bbush915

opennav_coverage/src/visualizer.cpp

@@ -44,6 +44,7 @@ void Visualizer::visualize(
     auto utm_path = std::make_unique<nav_msgs::msg::Path>(nav_path);
     utm_path->header.frame_id = GLOBAL_FRAME;
     for (unsigned int i = 0; i != utm_path->poses.size(); i++) {
+      utm_path->poses[i].header.frame_id = GLOBAL_FRAME;
       utm_path->poses[i].pose.position.x += ref_pt.getX();
       utm_path->poses[i].pose.position.y += ref_pt.getY();
     }