Keep only sdk errors in errors.h

[srasoamiaramanana-ledger]

Description

Keep only sdk errors in errors.h.

Changes include

• Bugfix (non-breaking change that solves an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)
• Tests
• Documentation
• Other (for changes that might not fit in any category)

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (d31f67c) 69.09% compared to head (17a0ea0) 69.09%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #401   +/-   ##
=======================================
  Coverage   69.09%   69.09%           
=======================================
  Files          11       11           
  Lines         864      864           
=======================================
  Hits          597      597           
  Misses        267      267           

Flag	Coverage Δ
unittests	69.09% <ø> (ø)

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[srasoamiaramanana-ledger]

Change ERR_APD_LEN to ERR_APP_APD_LEN in app-mimblewimblecoin: https://github.com/LedgerHQ/app-mimblewimblecoin/blob/master/src/continue_decrypting_slate.c#L75