Allow generating the xpub for root node

[coderofstuff]

Make the validation of GET_PUBLIC_KEY less strict to allow generation of paths m/44'/111111', m/44'/111111'/<account>, m/44'/111111'/<account>/<type> or m/44'/111111'/<account>/<type>/<index> . Previously it only allowed generation of the path m/44'/111111'/<account>/<type>/<index>

• This is to allow generation of xpub to allow generating all children addresses with only m/44'/111111'/<account> without the need to interact with the device.

[codecov-commenter]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (f4abd89) 91.96% compared to head (0c44680) 91.96%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #54   +/-   ##
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  Coverage   91.96%   91.96%           
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  Files           8        8           
  Lines         336      336           
=======================================
  Hits          309      309           
  Misses         27       27           

Flag	Coverage Δ
unittests	91.96% <ø> (ø)

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