Retain selections on bulk subject submission

[jimchamp]

Modifies bulk tag submission handler to prevent clearing selected works on successful submission. @mheiman mentions that this is likely the preferred experience, here.

Technical

Testing

While logged in with an account that can bulk tag works:

1. Go to a search page.
2. Select two or more items.
3. Using the bulk tagger, add at least one subject to the selected works.
4. Ensure that the selected works are still selected on success response.

Screenshot

Stakeholders

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (07d2cfa) 16.00% compared to head (6b878a4) 16.00%.
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #8533   +/-   ##
=======================================
  Coverage   16.00%   16.00%           
=======================================
  Files          86       86           
  Lines        4692     4691    -1     
  Branches      822      822           
=======================================
  Hits          751      751           
+ Misses       3416     3415    -1     
  Partials      525      525           

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