Use correct name for amino MsgSetFrozen.

[dzmitryhil]

Description

Use correct name for amino MsgSetFrozen.

Reviewers checklist:

• Try to write more meaningful comments with clear actions to be taken.
• Nit-picking should be unblocking. Focus on core issues.

Authors checklist

• Provide a concise and meaningful description
• Review the code yourself first, before making the PR.
• Annotate your PR in places that require explanation.
• Think and try to split the PR to smaller PR if it is big.

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This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.82%. Comparing base (91fe5a8) to head (580eea8).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #808   +/-   ##
=======================================
  Coverage   36.81%   36.82%           
=======================================
  Files         171      171           
  Lines       48543    48543           
=======================================
+ Hits        17873    17875    +2     
+ Misses      27297    27295    -2     
  Partials     3373     3373           

Flag	Coverage Δ
coreum	32.45% <ø> (+<0.01%)	⬆️
coreum-integration-tests-modules	22.88% <ø> (+0.02%)	⬆️

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[miladz68]

Reviewed 3 of 3 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @masihyeganeh, @wojtek-coreum, and @ysv)

[ysv]

Reviewed 3 of 3 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @masihyeganeh and @wojtek-coreum)

[miladz68]

Reviewed 1 of 1 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @masihyeganeh, @wojtek-coreum, and @ysv)