Fix deprecated parameters for JTC test node (#775)

Author: ozanpali

example_1/bringup/config/rrbot_joint_trajectory_publisher.yaml

@@ -5,10 +5,14 @@ publisher_joint_trajectory_controller:
     wait_sec_between_publish: 6
 
     goal_names: ["pos1", "pos2", "pos3", "pos4"]
-    pos1: [0.785, 0.785]
-    pos2: [0, 0]
-    pos3: [-0.785, -0.785]
-    pos4: [0, 0]
+    pos1:
+      positions: [0.785, 0.785]
+    pos2:
+      positions: [0.0, 0.0]
+    pos3:
+      positions: [-0.785, -0.785]
+    pos4:
+      positions: [0.0, 0.0]
 
     joints:
       - joint1