Bug: Post date gets set after saving a new draft instead of remaining floating

[amyevans]

Expected Behavior

The Publish value on a newly created post should say Immediately (remain "floating"), unless it is explicitly set by the user or created from the calendar view of the Edit Flow calendar module.

Actual Behavior

The post date on the post gets locked in as soon as you save the draft.

Steps to Reproduce the Problem

1. Enable the Edit Flow Calendar module
2. Add a new post
3. Click "Save draft"

Additional notes

This seems similar/related to #623 perhaps, but not exactly the same.

Screenshots

Behavior with Edit Flow calendar module:
Before save

After save

Behavior without Edit Flow calendar module:
Before save

After save

[mikeyarce]

@DustinHartzler can you take a look at this one?

[amyevans]

Going to close due to inactivity