fix config from env var

[tzemanovic]

Describe your changes

fixes #3953

The config-rs prefix separator behavior had a regression introduced after 0.11 rust-cli/config-rs#291 where instead of the previous single underscore prefix separator it was using the field separator with double underscore. The fix was introduced in rust-cli/config-rs#292 that allows to specify prefix separator.

Checklist before merging

• If this PR has some consensus breaking changes, I added the corresponding breaking:: labels
  • This will require 2 reviewers to approve the changes
• If this PR requires changes to the docs or specs, a corresponding PR is opened in the namada-docs repo
  • Relevant PR if applies:
• If this PR affects services such as namada-indexer or namada-masp-indexer, a corresponding PR is opened in that repo
  • Relevant PR if applies:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.00%. Comparing base (a148ac3) to head (b51078f).
Report is 50 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3971   +/-   ##
=======================================
  Coverage   73.99%   74.00%           
=======================================
  Files         341      341           
  Lines      106614   106634   +20     
=======================================
+ Hits        78888    78910   +22     
+ Misses      27726    27724    -2     

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[mergify]

Hey @tzemanovic, your pull request has been dequeued due to the following reason: CHECKS_FAILED.
Sorry about that, but you can requeue the PR by using @mergifyio requeue if you think this was a mistake.

[tzemanovic]

@Mergifyio requeue

[mergify]

requeue

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