no more hardcoded collectionPrefix

Author: giahienhoang99

src/storage/engines/types.ts

@@ -107,8 +107,7 @@ export abstract class StorageEngine {
     name: 'revisit',
   });
 
-  // protected collectionPrefix = import.meta.env.DEV ? 'dev-' : 'prod-';
-  protected collectionPrefix = 'prod-';
+  protected collectionPrefix = import.meta.env.DEV ? 'dev-' : 'prod-';
 
   protected studyId: string | undefined;