[#1399] Fix categories ordering in admin

[vaszig]

No description provided.

[codecov-commenter]

Codecov Report

Merging #657 (2b708f7) into develop (08d9a69) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop     #657   +/-   ##
========================================
  Coverage    96.45%   96.45%           
========================================
  Files          618      619    +1     
  Lines        21857    21861    +4     
========================================
+ Hits         21083    21087    +4     
  Misses         774      774           

Impacted Files	Coverage Δ
src/open_inwoner/pdc/tests/test_data_migrations.py	100.00% <ø> (ø)
...oner/pdc/migrations/0056_alter_category_options.py	100.00% <100.00%> (ø)
src/open_inwoner/pdc/models/category.py	94.59% <100.00%> (ø)
src/open_inwoner/pdc/tests/test_category_admin.py	100.00% <100.00%> (ø)

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