Profile serialization fix

[RiccardoM]

Description

This PR updated how a profile is updated, fixes #416

Checklist

• Targeted PR against correct branch.
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Wrote unit tests.
• Wrote integration tests (simulation & CLI).
• Updated the documentation.
• Added an entry to the CHANGELOG.md file.
• Re-reviewed Files changed in the Github PR explorer.

[codecov]

Codecov Report

Merging #417 (8193ac7) into master (d7319ab) will increase coverage by 1.93%.
The diff coverage is 89.69%.

@@            Coverage Diff             @@
##           master     #417      +/-   ##
==========================================
+ Coverage   70.50%   72.44%   +1.93%     
==========================================
  Files          90       66      -24     
  Lines        3696     3429     -267     
==========================================
- Hits         2606     2484     -122     
+ Misses       1005      847     -158     
- Partials       85       98      +13     

Impacted Files	Coverage Δ
x/staging/posts/keeper/keeper.go	100.00% <ø> (ø)
x/staging/reports/keeper/keeper.go	100.00% <ø> (ø)
x/profiles/keeper/grpc_query.go	67.56% <14.28%> (-13.08%)	⬇️
x/profiles/types/account.go	55.26% <64.70%> (+10.10%)	⬆️
x/profiles/keeper/alias_functions.go	84.61% <66.66%> (-15.39%)	⬇️
x/profiles/client/cli/query.go	64.21% <69.44%> (+4.21%)	⬆️
x/profiles/keeper/querier.go	70.31% <72.22%> (+1.56%)	⬆️
x/profiles/client/cli/tx.go	78.45% <79.66%> (+0.58%)	⬆️
x/profiles/types/genesis.go	92.30% <88.23%> (-7.70%)	⬇️
x/profiles/types/params.go	81.66% <90.90%> (ø)
... and 11 more

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