prevent inherited changes for joined pickups

[tiltec]

Closes karrot-dev/karrot-frontend#596

[codecov]

Codecov Report

Merging #346 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #346      +/-   ##
==========================================
+ Coverage   98.22%   98.23%   +<.01%     
==========================================
  Files         154      154              
  Lines        4168     4181      +13     
  Branches      181      181              
==========================================
+ Hits         4094     4107      +13     
  Misses         54       54              
  Partials       20       20

Impacted Files	Coverage Δ
foodsaving/stores/models.py	95.95% <100%> (-0.05%)	⬇️
foodsaving/stores/tests/test_pickupdates_api.py	99.54% <100%> (+0.01%)	⬆️

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