bug(app config): fix the wrong `bypass-min-fee-msg-types` key parse from the app config file (backport #1728)

[mergify[bot]]

This is an automatic backport of pull request #1728 done by Mergify. Cherry-pick of b50d37c4a348df92f77e4a450e63980e7d2e66d0 has failed:

On branch mergify/bp/release/v7.0.x/pr-1728
Your branch is up to date with 'origin/release/v7.0.x'.

You are currently cherry-picking commit b50d37c.
  (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:   app/params/config.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   app/app.go
	both modified:   cmd/gaiad/cmd/root.go

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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[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (release/v7.0.x@5db8fcc). Click here to learn what that means. The diff coverage is n/a.

Additional details and impacted files

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