Automatically synced content should have admin_imported=False

[bjester]

Observed behavior

Blaine forgot to follow up on this-- we need to ensure that metadata for automatically synced content has the admin_imported=False if the metadata doesn't already exist or the files are not available at time of syncing. The flag, when True, prevents resources from being garbage collected and removed the device's disk.

Expected behavior

1. When metadata is imported for content that will be automatically downloaded, if the metadata didn't already exist, the admin_imported flag should be set to False
2. If the admin later decides to import the same content, meaning the metadata already exists, the admin_imported flag should be set to True
3. If the admin 'removes' content that has automated syncing requests, it should set the admin_imported=False

User-facing consequences

File resources are not automatically removed from a device to make room for new content.

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[rtibbles]

If the admin later decides to import the same content, meaning the metadata already exists, the admin_imported flag should be set to True

I think there are two things that we need to do here - firstly update the admin_imported flag to default to True when the metadata is imported, and then also set it properly for the admin imported flow.