Hide usernames in preview panel when hidden in entry view

[droidmonkey]

• Fix Username in detail pane shown while hide username is active #6306

Screenshots

Type of change

• ✅ Bug fix (non-breaking change that fixes an issue)

[codecov-commenter]

Codecov Report

Base: 64.27% // Head: 64.25% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (b9e9a73) compared to base (1af985f).
Patch coverage: 73.91% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #8608      +/-   ##
===========================================
- Coverage    64.27%   64.25%   -0.02%     
===========================================
  Files          341      341              
  Lines        44302    44323      +21     
===========================================
+ Hits         28471    28477       +6     
- Misses       15831    15846      +15     

Impacted Files	Coverage Δ
src/gui/EntryPreviewWidget.cpp	84.60% <73.91%> (-0.47%)	⬇️
...rc/fdosecrets/widgets/SettingsWidgetFdoSecrets.cpp	56.06% <0.00%> (-3.03%)	⬇️
src/fdosecrets/dbus/DBusMgr.cpp	52.20% <0.00%> (-1.47%)	⬇️
src/core/FileWatcher.cpp	86.75% <0.00%> (+1.20%)	⬆️

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[phoerious]

We should remove the GUI_HideUsernames option in 2.8 and simply go with the two toggles from the view menu for everything.