[Inference] Remove useless code in quant attention

[lixcli]

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Description

Remove useless code in custom_attention.py

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 53.02%. Comparing base (dbd3947) to head (dde03e1). Report is 196 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #9231      +/-   ##
===========================================
- Coverage    53.22%   53.02%   -0.21%     
===========================================
  Files          657      657              
  Lines       107122   106311     -811     
===========================================
- Hits         57013    56367     -646     
+ Misses       50109    49944     -165     

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This Pull Request is stale because it has been open for 60 days with no activity. 当前Pull Request 60天内无活动，被标记为stale。