Remove some dead code in upload.go (#1920)

## Description

Code was missed when switching to having BackupOp supply the OwnersCats for a backup.

## Does this PR need a docs update or release note?

- [ ] ✅ Yes, it's included
- [ ] 🕐 Yes, but in a later PR
- [x] ⛔ No 

## Type of change

- [ ] 🌻 Feature
- [ ] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Test
- [ ] 💻 CI/Deployment
- [x] 🐹 Trivial/Minor

## Issue(s)

* #1781 

## Test Plan

- [ ] 💪 Manual
- [x] ⚡ Unit test
- [ ] 💚 E2E

src/internal/kopia/upload.go

@@ -575,10 +575,6 @@ func inflateCollectionTree(
 	// Temporary variable just to track the things that have been marked as
 	// changed while keeping a reference to their path.
 	changedPaths := []path.Path{}
-	ownerCats := &OwnersCats{
-		ResourceOwners: make(map[string]struct{}),
-		ServiceCats:    make(map[string]ServiceCat),
-	}
 
 	for _, s := range collections {
 		switch s.State() {
@@ -621,10 +617,6 @@ func inflateCollectionTree(
 			)
 		}
 
-		serviceCat := serviceCatTag(s.FullPath())
-		ownerCats.ServiceCats[serviceCat] = ServiceCat{}
-		ownerCats.ResourceOwners[s.FullPath().ResourceOwner()] = struct{}{}
-
 		// Make sure there's only a single collection adding items for any given
 		// path in the new hierarchy.
 		if node.collection != nil {