Fix newlines when copying from DatabaseWidget

[supershoop]

Fixes #8469
Newlines are no longer replaced with paragraph separators when copying notes from DatabaseWidget.

Testing strategy

Tested in Windows 11 using WSL

Type of change

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

[droidmonkey]

Love the simplicity

[codecov-commenter]

Codecov Report

Base: 64.39% // Head: 64.38% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (8356b18) compared to base (b1e7c34).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #8542      +/-   ##
===========================================
- Coverage    64.39%   64.38%   -0.01%     
===========================================
  Files          339      339              
  Lines        44007    44007              
===========================================
- Hits         28334    28330       -4     
- Misses       15673    15677       +4     

Impacted Files	Coverage Δ
src/gui/DatabaseWidget.cpp	61.16% <0.00%> (ø)
src/gui/Clipboard.cpp	78.95% <0.00%> (-7.02%)	⬇️

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