Transferred Unit Health Synchronization

**Describe the feature**
When transferring a unit to a teammate, if it has extra health over the base health of the unit but that health didn't come from veterancy, it is Removed entirely when transferred.

**Expected behavior**
Unit health should remain consistent across sharing, even if it has bonus health from non-vet. sources

**Screenshots**
N/A

**Additional context**
Context for a source of non-vet. bonus health is from the BrewLan modification set; despite being a mod I think a simple carry-over of health values would be a good idea in general.
(Asking the BL developer to do this on his end would be unfeasible most likely.)