refactor: reorder module declarations in download/mod.rs for consistency

src/download/mod.rs

@@ -1,5 +1,5 @@
-pub mod jpmaqsdownload;
 pub mod helpers;
-pub mod oauth_client;
-pub mod requester;
-pub mod parreq;
+pub mod jpmaqsdownload;
+mod oauth_client;
+mod parreq;
+mod requester;