Fix deleting existing socket file before making a new symbolic link

[varjolintu]

Removes the old socket before making a new symbolic link. Qt's function does not force it, and it does nothing if the target file already exists. Introduced in #8030.

Fixes #8634.

Type of change

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

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 64.28%. Comparing base (422fd91) to head (998974c).
Report is 349 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/browser/BrowserShared.cpp	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #8656      +/-   ##
===========================================
- Coverage    64.30%   64.28%   -0.01%     
===========================================
  Files          341      341              
  Lines        44330    44331       +1     
===========================================
- Hits         28502    28496       -6     
- Misses       15828    15835       +7     

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