Fix FWEO-1133 - APP SDK - Streamed transactions shouldn't have a back arrow navigation

[nroggeman-ledger]

Description

The goal of this PR is to fix https://ledgerhq.atlassian.net/browse/FWEO-1133 by a better analysis of when to draw the back navigation key.
Moreover, in transactions this back navigation key shall be placed at the same place, when we display the page number or not.

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 59.85%. Comparing base (29e06e7) to head (8d80c12).

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #633       +/-   ##
===========================================
+ Coverage        0   59.85%   +59.85%     
===========================================
  Files           0       12       +12     
  Lines           0     1684     +1684     
===========================================
+ Hits            0     1008     +1008     
- Misses          0      676      +676     

Flag	Coverage Δ
unittests	59.85% <ø> (?)

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