Flex/Stax: Progress bar fix

[abonnaudet-ledger]

Description

Fix a progress bar glitch that occured when a modal was displayed over a progress bar.
Example:
Ledger Flex Review: Suspiciously Good!

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

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 59.88%. Comparing base (e26d098) to head (412adaf).

Files	Patch %	Lines
lib_nbgl/src/nbgl_obj.c	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #752      +/-   ##
==========================================
- Coverage   59.94%   59.88%   -0.06%     
==========================================
  Files          12       12              
  Lines        1710     1710              
==========================================
- Hits         1025     1024       -1     
- Misses        685      686       +1     

Flag	Coverage Δ
unittests	59.88% <0.00%> (-0.06%)	⬇️

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