fix: EMA Oracle Benchmarking

[apopiak]

The tests and benchmarks were using hard-coded values and thus failed in the Basilisk benchmarks.

This fixes these issues.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.03 🎉

Comparison is base (9958aa7) 73.38% compared to head (059a2dd) 73.41%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #182      +/-   ##
==========================================
+ Coverage   73.38%   73.41%   +0.03%     
==========================================
  Files          41       41              
  Lines        3438     3442       +4     
==========================================
+ Hits         2523     2527       +4     
  Misses        915      915              

Impacted Files	Coverage Δ
ema-oracle/src/benchmarking.rs	98.77% <100.00%> (+0.03%)	⬆️

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