refactor(oracle): simplify window progress query

[adamewozniak]

Simplifies the math for the oracle window progress query.

This was one of those things, "wait, why did I do it that way?"

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• confirmed the correct type prefix in the PR title
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[codecov-commenter]

Codecov Report

Merging #1294 (e19e8d9) into main (4bdbf52) will decrease coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1294      +/-   ##
==========================================
- Coverage   51.39%   51.34%   -0.05%     
==========================================
  Files          68       68              
  Lines        6841     6834       -7     
==========================================
- Hits         3516     3509       -7     
  Misses       3067     3067              
  Partials      258      258              

Impacted Files	Coverage Δ
x/oracle/types/query.pb.gw.go	0.00% <ø> (ø)
x/oracle/keeper/grpc_query.go	97.91% <100.00%> (-0.10%)	⬇️