Fix a PUT bug, and consistently handle updates to non-winning leaf revs

[flimzy]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 89.36170% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 64.29%. Comparing base (f1783a9) to head (33b15a0).

Files	Patch %	Lines
x/sqlite/put.go	88.23%	1 Missing and 1 partial ⚠️
x/sqlite/putattachment.go	80.00%	1 Missing and 1 partial ⚠️
x/sqlite/util.go	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #921      +/-   ##
==========================================
- Coverage   64.30%   64.29%   -0.02%     
==========================================
  Files         297      297              
  Lines       19795    19782      -13     
==========================================
- Hits        12730    12719      -11     
+ Misses       6462     6460       -2     
  Partials      603      603              

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