fix(server): properly parse multiple gas config (backport #18537)

[mergify]

This is an automatic backport of pull request #18537 done by Mergify.
Cherry-pick of 875a71c has failed:

On branch mergify/bp/release/v0.47.x/pr-18537
Your branch is up to date with 'origin/release/v0.47.x'.

You are currently cherry-picking commit 875a71cc6.
  (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:   CHANGELOG.md
	modified:   server/README.md
	modified:   server/config/config.go
	modified:   server/config/config_test.go
	modified:   server/config/toml.go

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   simapp/simd/cmd/commands.go
	deleted by us:   tools/confix/data/v0.47-app.toml
	deleted by us:   tools/confix/data/v0.50-app.toml

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

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