chore: improve `x/profiles` by mutation test

Description

~~Deps: #1231~~ This PR improves x/profiles by mutation tests to increase mutation score of x/profiles to 0.887324.

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### WARNING! This test will take hours to complete!
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running mutation tests for the following module(s): profiles
writing mutation test result to mutation_test_result.txt
The mutation score is 0.887324 (252 passed, 2 failed, 0 duplicated, 30 skipped, total is 284)

Author Checklist

All items are required. Please add a note to the item if the item is not applicable and please add links to any relevant follow up issues.

I have...

[x] included the correct type prefix in the PR title
[ ] added ! to the type prefix if API or client breaking change
[x] targeted the correct branch (see PR Targeting)
[ ] provided a link to the relevant issue or specification
[ ] followed the guidelines for building modules
[ ] included the necessary unit and integration tests
[ ] added a changelog entry to CHANGELOG.md
[ ] included comments for documenting Go code
[ ] updated the relevant documentation or specification
[x] reviewed "Files changed" and left comments if necessary
[x] confirmed all CI checks have passed

Reviewers Checklist

All items are required. Please add a note if the item is not applicable and please add your handle next to the items reviewed if you only reviewed selected items.

I have...

[ ] confirmed the correct type prefix in the PR title
[ ] confirmed ! in the type prefix if API or client breaking change
[ ] confirmed all author checklist items have been addressed
[ ] reviewed state machine logic
[ ] reviewed API design and naming
[ ] reviewed documentation is accurate
[ ] reviewed tests and test coverage
[ ] manually tested (if applicable)

Codecov Report

All modified lines are covered by tests :white_check_mark:

Files	Coverage Δ
x/profiles/keeper/grpc_query.go	`78.46% <100.00%> (-1.06%)`	:arrow_down:
x/profiles/keeper/keeper.go	`94.11% <100.00%> (+2.20%)`	:arrow_up:
x/profiles/keeper/msg_server_app_link.go	`91.66% <ø> (+91.66%)`	:arrow_up:
x/profiles/keeper/msg_server_dtag_transfers.go	`82.08% <100.00%> (+4.80%)`	:arrow_up:
x/profiles/keeper/relay_app_links.go	`87.19% <100.00%> (ø)`
x/profiles/keeper/relay_chain_links.go	`85.00% <ø> (-1.37%)`	:arrow_down:
x/profiles/types/account.go	`58.29% <100.00%> (+20.02%)`	:arrow_up:
x/profiles/types/models_params.go	`90.06% <100.00%> (ø)`

... and 10 files with indirect coverage changes

:loudspeaker: Thoughts on this report? Let us know!.

desmos-labs / desmos