fix(zjow): fix complex obs demo for ppo pipeline

[zjowowen]

#784

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 75.85%. Comparing base (aeb4c9c) to head (78a2739).
Report is 1 commits behind head on main.

❗ Current head 78a2739 differs from pull request most recent head 9cc2dc8. Consider uploading reports for the commit 9cc2dc8 to get more accurate results

Files	Patch %	Lines
ding/utils/dict_helper.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #786      +/-   ##
==========================================
- Coverage   75.89%   75.85%   -0.04%     
==========================================
  Files         681      682       +1     
  Lines       55287    55189      -98     
==========================================
- Hits        41958    41864      -94     
+ Misses      13329    13325       -4     

Flag	Coverage Δ
unittests	75.85% <80.00%> (-0.04%)	⬇️

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