refactor: rename secondPassphrase to secondMnemonic

[faustbrian]

No description provided.

[codecov]

Codecov Report

Merging #408 into master will decrease coverage by 0.85%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #408      +/-   ##
==========================================
- Coverage   77.44%   76.58%   -0.86%     
==========================================
  Files          63       63              
  Lines        1614     1589      -25     
  Branches      152      145       -7     
==========================================
- Hits         1250     1217      -33     
- Misses        361      368       +7     
- Partials        3        4       +1     

Impacted Files	Coverage Δ
src/services/client.ts	86.74% <0.00%> (-3.79%)	⬇️
src/services/transaction.ts	43.20% <0.00%> (-3.78%)	⬇️
src/services/message.ts	96.00% <0.00%> (-0.30%)	⬇️
src/services/ledger.ts	95.58% <0.00%> (-0.07%)	⬇️
src/services/fee.ts	100.00% <0.00%> (+3.57%)	⬆️

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