[audit] 13. Unneeded code

[NoahSaso]

From Oak:

In contracts/voting/dao-voting-onft-staked/src/contract.rs:178-180, the execute_confirm_stake function removes the PREPARED_ONFTS state based on the supplied token IDs. This is unneeded because the register_staked_nfts function already removed them in contracts/voting/dao-voting-onft-staked/src/state.rs:73.

This fix removes the unnecessary code.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.65%. Comparing base (75272b9) to head (07ffdd5).

Additional details and impacted files

@@             Coverage Diff              @@
##           development     #870   +/-   ##
============================================
  Coverage        96.64%   96.65%           
============================================
  Files              240      240           
  Lines            65294    65292    -2     
============================================
- Hits             63106    63105    -1     
+ Misses            2188     2187    -1     

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