[BUG][TST] Fix bug in tenant state machine test (#1290)

## Description of changes

*Summarize the changes made by this PR.*
 - Improvements & Bug fixes
- Fixes a small bug in the tenant/collections state machine to reference
the model, not the collection object, since the collection object should
only be name placeholder.
 - New functionality
	 - None

## Test plan
*How are these changes tested?*
These are tests.
- [x] Tests pass locally with `pytest` for python, `yarn test` for js

## Documentation Changes
None required.

chromadb/test/property/test_collections.py

@@ -191,8 +191,8 @@ def modify_coll(
                     c.modify(metadata=new_metadata, name=new_name)
                 return multiple()
 
+            self.set_model(new_name, self.model[coll.name])
             self.delete_from_model(coll.name)
-            self.set_model(new_name, coll.metadata)
             coll.name = new_name
 
         c.modify(metadata=new_metadata, name=new_name)