Fix Server::setAddress

[sgourdas]

This brings a change from the closed #1147 that fixes multiple uses of Server::setAddress.

Now the m_addr field is cleared before setting a new ip.

Helps a lot especially in kiwix-desktop local server, when multiple servers may be started.

Fixes #1150

[sgourdas]

@kelson42 would be good to include this in the 14 release as well. It is a small fix.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 41.47%. Comparing base (c8bddd6) to head (8b00c2e).
Report is 21 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1151      +/-   ##
==========================================
+ Coverage   41.45%   41.47%   +0.02%     
==========================================
  Files          59       59              
  Lines        4270     4272       +2     
  Branches     2336     2336              
==========================================
+ Hits         1770     1772       +2     
  Misses        999      999              
  Partials     1501     1501              

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