Fix entry preview rendering HTML

[droidmonkey]

• Fixes Rich text markup in password is interpreted in preview pane #11538
• Prevent rendering HTML in Title, Password, and URL fields in the entry preview pane.

Type of change

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

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 63.91%. Comparing base (b1180b3) to head (7b70cc9).
Report is 26 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/gui/EntryPreviewWidget.cpp	66.67%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #11539      +/-   ##
===========================================
+ Coverage    63.91%   63.91%   +0.01%     
===========================================
  Files          362      362              
  Lines        38147    38147              
===========================================
+ Hits         24378    24381       +3     
+ Misses       13769    13766       -3     

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