Blender Git Loki

Avoid flow to avoid the collection textfield from becoming too small

The collection instance field is currently using flow.column(), which makes the name of the collection instance unreadably small. {F6898084}
I get that we want to save vertical space to avoid scrolling, but in this case it generates a new problem, so I'd rather avoid flow here.

Patch by sebastian_k

Reviewed By: billreynish

Differential Revision: https://developer.blender.org/D4614