libstore: Make all StoreConfig::getReference implementations return store parameters

These stragglers have been accidentally left out when implementing the StoreConfig::getReference.
Also HttpBinaryCacheStore::getReference now returns the actual store parameters, not the cacheUri
parameters.

src/libstore/s3-binary-cache-store.cc

@@ -262,6 +262,7 @@ StoreReference S3BinaryCacheStoreConfig::getReference() const
                 .scheme = *uriSchemes().begin(),
                 .authority = bucketName,
             },
+        .params = getQueryParams(),
     };
 }