refactor(tm2/crypto): do not use build tags to mock ledger

[thehowl]

Contributors' checklist...

• Added new tests, or not needed, or not feasible
• Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory
• Updated the official documentation or not needed
• No breaking changes were made, or a BREAKING CHANGE: xxx message was included in the description
• Added references to related issues and PRs
• Provided any useful hints for running manual tests
• Added new benchmarks to generated graphs, if any. More info here.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 14 lines in your changes are missing coverage. Please review.

Project coverage is 49.07%. Comparing base (e1586a5) to head (d17a478).
Report is 4 commits behind head on master.

Files	Patch %	Lines
tm2/pkg/crypto/internal/ledger/discover.go	50.00%	11 Missing ⚠️
tm2/pkg/crypto/ledger/ledger_secp256k1.go	50.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2173      +/-   ##
==========================================
+ Coverage   49.01%   49.07%   +0.06%     
==========================================
  Files         576      576              
  Lines       77604    77621      +17     
==========================================
+ Hits        38035    38090      +55     
+ Misses      36486    36439      -47     
- Partials     3083     3092       +9     

Flag	Coverage Δ
tm2	54.72% <50.00%> (+0.16%)	⬆️

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[zivkovicmilos]

Thank you for the fix 🙏