add mpc plugin loader changes for lab_sim due to rearch

Author: bkanator

src/lab_sim/config/config.yaml

@@ -46,6 +46,7 @@ objectives:
     # Add additional plugin loaders as needed.
     core:
       - "moveit_studio::behaviors::CoreBehaviorsLoader"
+      - "moveit_studio::behaviors::MPCBehaviorsLoader"
       - "moveit_studio::behaviors::MTCCoreBehaviorsLoader"
       - "moveit_studio::behaviors::ServoBehaviorsLoader"
       - "moveit_studio::behaviors::VisionBehaviorsLoader"