fix: slash window progress reset

[adamewozniak]

Description

Fixes an issue where the slash window progress doesn't reset at the end of the slashing window

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[adamewozniak]

Just was checking on mainnet & had to slip this one in before I got on the plane

[codecov-commenter]

Codecov Report

Merging #1471 (8da0486) into main (4519faf) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1471   +/-   ##
=======================================
  Coverage   52.75%   52.75%           
=======================================
  Files          71       71           
  Lines        6750     6750           
=======================================
  Hits         3561     3561           
  Misses       2920     2920           
  Partials      269      269           

Impacted Files	Coverage Δ
x/oracle/keeper/grpc_query.go	97.91% <100.00%> (ø)