v1.18: [anza migration] fix: use the correct log filter for non-unix (backport of #245)

[mergify]

Problem

I removed the filter variable in #223, but I didn't notice that the non-Unix code was also using it 😞

Summary of Changes

use the new public const in the solana_logger

agave/logger/src/lib.rs

Line 13 in 51dc7e6

pub const DEFAULT_FILTER: &str = "solana=info,agave=info";

---

This is an automatic backport of pull request #245 done by Mergify.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.6%. Comparing base (e9bc805) to head (1bd765e).

Additional details and impacted files

@@           Coverage Diff           @@
##            v1.18     #288   +/-   ##
=======================================
  Coverage    81.6%    81.6%           
=======================================
  Files         827      827           
  Lines      224517   224517           
=======================================
+ Hits       183263   183276   +13     
+ Misses      41254    41241   -13