fix: correct TestAsyncComputeMissingRanges

[arajasek]

#2642 accidentally copy-pasted and extra assertion, this fixes that up.

[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Jan 2, 2026, 4:56 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 43.73%. Comparing base (884e779) to head (8277d08).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2655      +/-   ##
==========================================
+ Coverage   42.01%   43.73%   +1.71%     
==========================================
  Files        1018     1902     +884     
  Lines       84809   158679   +73870     
==========================================
+ Hits        35636    69392   +33756     
- Misses      45834    82900   +37066     
- Partials     3339     6387    +3048     

Flag	Coverage Δ
sei-chain	45.69% <ø> (?)
sei-cosmos	38.20% <ø> (+<0.01%)	⬆️
sei-db	69.06% <ø> (ø)
sei-tendermint	47.34% <ø> (-0.02%)	⬇️

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see 899 files with indirect coverage changes

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