perf(ante/fee): optimize requiredFees calculation

[robert-zaremba]

Description

Ref: https://github.com/umee-network/umee/pull/1411/files#r973809128

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Author Checklist

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I have...

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• confirmed the correct type prefix in the PR title
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• manually tested (if applicable)

[codecov-commenter]

Codecov Report

Merging #1418 (c4cfb1f) into main (4124ef7) will decrease coverage by 0.02%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##             main    #1418      +/-   ##
==========================================
- Coverage   52.83%   52.80%   -0.03%     
==========================================
  Files          70       70              
  Lines        6751     6751              
==========================================
- Hits         3567     3565       -2     
- Misses       2914     2916       +2     
  Partials      270      270              

Impacted Files	Coverage Δ
ante/fee.go	78.35% <83.33%> (-2.07%)	⬇️