fix: x/gov client deposits tests

[facundomedica]

Description

These tests were testing some odd conditions which shouldn't be possible in this module. Why they were passing? Because the test code had bugs itself. Check the issues below for more details.

Closes: #11936
Closes: #11926

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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...

• included the correct type prefix in the PR title
• added ! to the type prefix if API or client breaking change
• 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
• reviewed "Files changed" and left comments if necessary
• 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]

Codecov Report

Merging #11940 (ca1354e) into main (98710db) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main   #11940      +/-   ##
==========================================
- Coverage   66.00%   65.97%   -0.03%     
==========================================
  Files         676      676              
  Lines       71333    71307      -26     
==========================================
- Hits        47080    47048      -32     
- Misses      21570    21578       +8     
+ Partials     2683     2681       -2     

Impacted Files	Coverage Δ
x/gov/client/testutil/deposits.go	90.27% <100.00%> (-3.84%)	⬇️
crypto/keys/internal/ecdsa/privkey.go	82.45% <0.00%> (-1.76%)	⬇️
x/group/keeper/keeper.go	54.62% <0.00%> (-0.43%)	⬇️