Rename Body to MixedRealityPlayspace

Author: keveleigh

Assets/MixedRealityToolkit-Examples/Demos/Solvers/Scenes/Solvers.unity

@@ -288,7 +288,7 @@ GameObject:
   m_Component:
   - component: {fileID: 74001234}
   m_Layer: 0
-  m_Name: Body
+  m_Name: MixedRealityPlayspace
   m_TagString: Untagged
   m_Icon: {fileID: 0}
   m_NavMeshLayer: 0