Fix wrong highlighted app icon on Nano when this icon is compress

[nroggeman-ledger]

Description

The goal of this PR is to fix wrong highlighted app icon on Nano when this icon is compress.
Now the icon concatenated to app binary is never compressed for Nano apps

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

All modified and coverable lines are covered by tests ✅

Project coverage is 60.19%. Comparing base (347b86e) to head (161335a).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #719   +/-   ##
=======================================
  Coverage   60.19%   60.19%           
=======================================
  Files          12       12           
  Lines        1726     1726           
=======================================
  Hits         1039     1039           
  Misses        687      687           

Flag	Coverage Δ
unittests	60.19% <ø> (ø)

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