fix uninitialized orientation in default shape pose

[v4hn]

I wonder why I failed to see this during the review...

[codecov]

Codecov Report

Merging #2896 (546e85b) into master (35275a0) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2896      +/-   ##
==========================================
+ Coverage   60.95%   60.97%   +0.02%     
==========================================
  Files         373      373              
  Lines       31740    31742       +2     
==========================================
+ Hits        19344    19351       +7     
+ Misses      12396    12391       -5     

Impacted Files	Coverage Δ
moveit_core/planning_scene/src/planning_scene.cpp	63.91% <100.00%> (+0.07%)	⬆️
...meterization/work_space/pose_model_state_space.cpp	80.51% <0.00%> (-2.51%)	⬇️
...g_scene_interface/src/planning_scene_interface.cpp	48.56% <0.00%> (-1.15%)	⬇️
...on/pick_place/src/approach_and_translate_stage.cpp	73.38% <0.00%> (-0.64%)	⬇️
...dl_kinematics_plugin/src/kdl_kinematics_plugin.cpp	77.87% <0.00%> (-0.38%)	⬇️
...raint_samplers/src/default_constraint_samplers.cpp	78.94% <0.00%> (-0.29%)	⬇️
...ipulation/pick_place/src/manipulation_pipeline.cpp	71.30% <0.00%> (+1.86%)	⬆️
moveit_core/robot_model/src/joint_model_group.cpp	63.86% <0.00%> (+2.12%)	⬆️
...e/src/parameterization/model_based_state_space.cpp	71.33% <0.00%> (+2.80%)	⬆️

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