Flex: Fix HTA double segment issue

[abonnaudet-ledger]

https://ledgerhq.atlassian.net/browse/FWEO-1128

Description

When fast mode is enabled, first "hold to approve" segments were displayed almost at the same time. One at touch, the other on the next ticker event.
This commit remove the first segment that is displayed at touch.

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 59.89%. Comparing base (a3b340f) to head (a34447f).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #635   +/-   ##
=======================================
  Coverage   59.89%   59.89%           
=======================================
  Files          12       12           
  Lines        1688     1688           
=======================================
  Hits         1011     1011           
  Misses        677      677           

Flag	Coverage Δ
unittests	59.89% <ø> (ø)

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