fix: lekin examples with forward and backward scheduling

[yuetan1988]

Description

This PR fix the examples

Checklist

• Linked issues (if existing)
• Amended changelog.md for large changes (and added myself there as contributor)
• Added/modified tests
• Used pre-commit hooks when committing to ensure that code is compliant with hooks. Install hooks with pre-commit install.
  To run hooks independent of commit, execute pre-commit run --all-files

Thank you for joining. Have fun coding!

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 27.05%. Comparing base (609deba) to head (78f096c).

Files	Patch %	Lines
lekin/lekin_struct/job.py	0.00%	1 Missing ⚠️
lekin/lekin_struct/resource.py	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##           master      #36   +/-   ##
=======================================
  Coverage   27.05%   27.05%           
=======================================
  Files          27       27           
  Lines         987      987           
=======================================
  Hits          267      267           
  Misses        720      720           

Flag	Coverage Δ
cpu	27.05% <0.00%> (ø)
unittest	27.05% <0.00%> (ø)

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