Fix rendering & and " in password preview

[droidmonkey]

Forgot to include this fix based on discussion in #11538 (comment)

Testing strategy

Tested before/after, code change correctly shows password

Type of change

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

[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 63.90%. Comparing base (af0c164) to head (3354bd6).
Report is 18 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/gui/EntryPreviewWidget.cpp	25.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #11594      +/-   ##
===========================================
- Coverage    63.90%   63.90%   -0.00%     
===========================================
  Files          362      362              
  Lines        38153    38155       +2     
===========================================
+ Hits         24380    24381       +1     
- Misses       13773    13774       +1     

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[droidmonkey]

Actually need to fix it in the title field as well

[phoerious]

Maybe check all the other places as well, also the ones where we already escape. It either needs to be HTML escaping with HTML formatting on or plain text. But HTML escaping with auto format will break.

[droidmonkey]

Yup agree

[droidmonkey]

@phoerious this is ready to go: