Set access to 1 on new calendars to handle share with null

[Trekky12]

When a new calendar is created via DAV or from the iOS calendar app a "empty" shared user (null) is always created.
Apparently the iOS calendar app assumes to have a shared-owner calendar even when the calendar is not shared.
see sabre-io/Baikal#1090

This PR sets the access value for new calendars to '1' like it is already done in baikal

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.20%. Comparing base (ed901a9) to head (399507a).
Report is 9 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1581      +/-   ##
============================================
- Coverage     97.23%   97.20%   -0.03%     
  Complexity     2836     2836              
============================================
  Files           175      175              
  Lines          9028     9008      -20     
============================================
- Hits           8778     8756      -22     
- Misses          250      252       +2     

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