fix tests for did-filtering

constellation/src/storage/mod.rs

···
                 version: (0, 0),
                 items: vec![],
                 next: None,
+                total: 0,
             }
         );
 
···
                     rkey: "asdf".into(),
                 },],
                 next: None,
+                total: 1,
             }
         );
 
···
                 version: (0, 0),
                 items: vec![],
                 next: None,
+                total: 0,
             }
         );
 
···
                     },
                 ],
                 next: None,
+                total: 2,
             }
         );
 
···
                     },
                 ],
                 next: Some(1),
+                total: 3,
             }
         );
 
···
                 version: (0, 0),
                 items: vec![],
                 next: None,
+                total: 0,
             }
         );
     });