removes modifiedTime from persisted owners

[theseyi]

No description provided.

[codecov-io]

Codecov Report

Merging #983 into master will decrease coverage by 0.01%.
The diff coverage is 80%.

@@            Coverage Diff             @@
##           master     #983      +/-   ##
==========================================
- Coverage   27.37%   27.36%   -0.02%     
==========================================
  Files         170      170              
  Lines        4624     4630       +6     
  Branches     1209     1210       +1     
==========================================
+ Hits         1266     1267       +1     
- Misses       3358     3363       +5

Impacted Files	Coverage Δ
wherehows-web/app/utils/api/datasets/owners.ts	81.01% <80%> (-5.29%)	⬇️

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[coveralls]

Coverage remained the same at 27.651% when pulling ea6273b on theseyi:object-filter-owner into e3672d8 on linkedin:master.