Changing default directory_visibility

[gersonfs]

In an environment where we have a web server running with the nobody user and PHP running in its own user, it is not possible by default for http server to directly access files in folders created by this plugin. I believe that if the file has public visibility by default, it makes sense to me that the folder should also be.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.87%. Comparing base (324dc73) to head (10a0478).
Report is 14 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #611      +/-   ##
============================================
+ Coverage     95.84%   95.87%   +0.02%     
- Complexity      109      110       +1     
============================================
  Files            11       11              
  Lines           289      291       +2     
============================================
+ Hits            277      279       +2     
  Misses           12       12              

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