Use new right mixin

Codecov Report

Merging #1139 (6ad69ef7) into master (1d41d222) will decrease coverage by 0.01%. The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master    #1139      +/-   ##
==========================================
- Coverage   88.01%   88.00%   -0.02%     
==========================================
  Files         248      249       +1     
  Lines       16448    16459      +11     
==========================================
+ Hits        14476    14484       +8     
- Misses       1972     1975       +3

Impacted Files	Coverage Δ
...ex/documents/management/commands/build_fixtures.py	`0.00% <0.00%> (ø)`
arkindex/users/migrations/0011_corpus_rights.py	`66.66% <66.66%> (ø)`
arkindex/dataimport/tests/test_imports.py	`99.80% <100.00%> (-0.01%)`
arkindex/dataimport/tests/test_repos.py	`100.00% <100.00%> (ø)`
arkindex/documents/api/elements.py	`98.51% <100.00%> (+<0.01%)`
arkindex/documents/api/ml.py	`97.76% <100.00%> (+0.01%)`
arkindex/documents/tests/test_classes.py	`100.00% <100.00%> (ø)`
arkindex/documents/tests/test_destroy_elements.py	`100.00% <100.00%> (ø)`
arkindex/project/mixins.py	`96.00% <100.00%> (+3.40%)`
arkindex/project/tests/test_acl_mixin.py	`100.00% <100.00%> (ø)`
... and 2 more

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