Better Kiwix Server taskbar home button max-width

[kelson42]

Fixes #1084

I have increase the max-width of the Kiwix Server Home button to 30ch. Even if 30ch does not mean 30 characters, this is more or less the maximum width. It might happen that make it even a bit bigger in the future, but I didn't wanted to take too much risk to generate a regression of some kind.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 40.93%. Comparing base (7366938) to head (6ee0911).
Report is 42 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1088   +/-   ##
=======================================
  Coverage   40.93%   40.93%           
=======================================
  Files          58       58           
  Lines        4204     4204           
  Branches     2307     2307           
=======================================
  Hits         1721     1721           
  Misses       1015     1015           
  Partials     1468     1468           

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