Add --overwrite to benchmark script to satisfy new check

[stevenlanders]

Describe your changes and provide context

• A recent commit added a new requirement that --overwrite be passed: 00e4138
• This adds the flag to benchmark (it was already in the init local chain script)

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Feb 17, 2026, 3:21 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.22%. Comparing base (8fc1d5b) to head (4795575).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2907   +/-   ##
=======================================
  Coverage   57.21%   57.22%           
=======================================
  Files        2093     2093           
  Lines      171755   171732   -23     
=======================================
- Hits        98276    98275    -1     
+ Misses      64709    64681   -28     
- Partials     8770     8776    +6     

Flag	Coverage Δ
sei-chain	52.69% <ø> (-0.01%)	⬇️
sei-cosmos	48.19% <ø> (+0.04%)	⬆️
sei-db	68.72% <ø> (ø)

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see 34 files with indirect coverage changes

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