fix(server): properly parse multiple gas config(backport cosmos/cosmos-sdk#18537) (backport #1337)

[mergify]

Description

• fix for multiple gas parsing
  • fix(server): properly parse multiple gas config cosmos/cosmos-sdk#18537

Motivation and context

How has this been tested?

Screenshots (if appropriate):

Checklist:

• I followed the contributing guidelines and code of conduct.
• I have added a relevant changelog to CHANGELOG.md
• I have added tests to cover my changes.
• I have updated the documentation accordingly.
• I have updated API documentation client/docs/swagger-ui/swagger.yaml

---

This is an automatic backport of pull request #1337 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 7849929 has failed:

On branch mergify/bp/release/v0.47.x/pr-1337
Your branch is up to date with 'origin/release/v0.47.x'.

You are currently cherry-picking commit 78499290a.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   server/config/config.go
	modified:   server/config/config_test.go
	modified:   server/config/toml.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   CHANGELOG.md

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 62.15%. Comparing base (92d75cf) to head (84ef175).
Report is 10 commits behind head on release/v0.47.x.

Additional details and impacted files

@@                 Coverage Diff                 @@
##           release/v0.47.x    #1344      +/-   ##
===================================================
+ Coverage            62.04%   62.15%   +0.10%     
===================================================
  Files                  655      655              
  Lines                78983    78863     -120     
===================================================
+ Hits                 49004    49014      +10     
+ Misses               27293    27162     -131     
- Partials              2686     2687       +1     

Files	Coverage Δ
server/config/toml.go	20.00% <ø> (ø)
server/config/config.go	46.25% <33.33%> (+2.83%)	⬆️

... and 1 file with indirect coverage changes