Update PouchDB expectations for Changes feed tests

[flimzy]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.24%. Comparing base (4c985fc) to head (f2ca5c1).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1086      +/-   ##
==========================================
+ Coverage   63.23%   63.24%   +0.01%     
==========================================
  Files         286      286              
  Lines       19113    19113              
==========================================
+ Hits        12086    12088       +2     
+ Misses       6486     6485       -1     
+ Partials      541      540       -1     

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