Assign contributing paths in simple cases for snapshots

src/snapshot_middleware/rbxmx.rs

@@ -45,7 +45,7 @@ impl SnapshotMiddleware for SnapshotRbxmx {
         if children.len() == 1 {
             let mut snapshot = InstanceSnapshot::from_tree(&temp_tree, children[0]);
             snapshot.name = Cow::Owned(instance_name);
-            // TODO: Assign snapshot.source
+            snapshot.metadata.contributing_paths = vec![entry.path().to_path_buf()];
 
             Ok(Some(snapshot))
         } else {