unfreeze the rig in unit test

Author: jamesbaber1

test/unit_tests/send2ue_skeletal_meshes.py

@@ -120,6 +120,9 @@ def test_send_ue2rigify_mannequin_rig_to_unreal(self):
         bpy.data.collections['Rig'].objects.link(mannequin_rig)
         bpy.context.scene.collection.objects.unlink(mannequin_rig)
 
+        # unfreeze the rig
+        bpy.context.window_manager.ue2rigify.freeze_rig = False
+
         # set the source rig
         bpy.context.window_manager.ue2rigify.source_rig_name = 'root'