Remove redundant copy from dockerfile

[masih]

The wasmd and ibc go sub modules are flattened. This makes COPY statements redundant in Dockerfile.

[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Jan 5, 2026, 2:22 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 43.77%. Comparing base (25bf825) to head (97cb8e0).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2657      +/-   ##
==========================================
- Coverage   43.78%   43.77%   -0.01%     
==========================================
  Files        1904     1904              
  Lines      158932   158932              
==========================================
- Hits        69582    69579       -3     
- Misses      82947    82952       +5     
+ Partials     6403     6401       -2     

Flag	Coverage Δ
sei-chain	45.81% <ø> (-0.02%)	⬇️
sei-cosmos	38.20% <ø> (ø)
sei-db	69.06% <ø> (ø)
sei-tendermint	47.29% <ø> (+0.01%)	⬆️

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see 17 files with indirect coverage changes

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