wallet: change the derivation path for modified ZIP32

[tzemanovic]

Describe your changes

Checklist before merging

• If this PR has some consensus breaking changes, I added the corresponding breaking:: labels
  • This will require 2 reviewers to approve the changes
• If this PR requires changes to the docs or specs, a corresponding PR is opened in the namada-docs repo
  • Relevant PR if applies:
• If this PR affects services such as namada-indexer or namada-masp-indexer, a corresponding PR is opened in that repo
  • Relevant PR if applies:

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 6 lines in your changes missing coverage. Please review.

Project coverage is 74.17%. Comparing base (759fcfc) to head (2868f4f).
Report is 41 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/wallet/src/lib.rs	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4307      +/-   ##
==========================================
+ Coverage   74.06%   74.17%   +0.11%     
==========================================
  Files         345      345              
  Lines      110193   110608     +415     
==========================================
+ Hits        81611    82042     +431     
+ Misses      28582    28566      -16     

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