Exclude draft form definitions from Central list

[lognaturel]

Closes #861

What has been done to verify that this works as intended?

Added a draft form definition to Central project, configured that project as a pull source, verified that the draft form didn't show up in the list.

Why is this the best possible solution? Were any other approaches considered?

This filters out drafts which is exactly what we want. I don't see any other possibilities.

How does this change affect users? Describe intentional changes to behavior and behavior that could have accidentally been affected by code changes. In other words, what are the regression risks?

It should just fix the bug. It's a one line change that's very targeted so should truly be very low risk.

Does this change require updates to documentation? If so, please file an issue at https://github.com/getodk/docs/issues/new and include the link below.

No.

[codecov-io]

Codecov Report

Merging #885 into master will decrease coverage by 0.04%. The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master     #885      +/-   ##
============================================
- Coverage     48.33%   48.28%   -0.05%     
+ Complexity     1647     1645       -2     
============================================
  Files           195      195              
  Lines         10422    10423       +1     
  Branches        753      753              
============================================
- Hits           5037     5033       -4     
- Misses         5026     5029       +3     
- Partials        359      361       +2     

Impacted Files	Coverage Δ	Complexity Δ
...takit/briefcase/reused/transfer/CentralServer.java	81.81% <0.00%> (-0.50%)	38.00 <1.00> (+1.00)	:arrow_down:
...g/opendatakit/briefcase/ui/export/ExportPanel.java	48.07% <0.00%> (-1.93%)	14.00% <0.00%> (-1.00%)
...g/opendatakit/briefcase/reused/UncheckedFiles.java	44.53% <0.00%> (-1.69%)	31.00% <0.00%> (-1.00%)

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[kkrawczyk123]

Tested with success! Verified on Ubuntu.

Tested cases:

• draft form not visible on pull tab
• publish draft and reload form list
• try to pull using cmd
• ui and cmd pull of published form from Central
• ui and cmd pull from Aggregate
• ui and cmd pull from odk dir

@getodk-bot unlabel "needs testing" @getodk-bot label "behavior verified"