Fix cache and storage issues in share and filepicker iframes

www/filepicker/main.js

@@ -58,7 +58,7 @@ define([
                     // Remove the listener once we've received the READY message
                     window.removeEventListener('message', whenReady);
                     // Answer with the requested data
-                    postMsg(JSON.stringify({ txid: data.txid, language: Cryptpad.getLanguage() }));
+                    postMsg(JSON.stringify({ txid: data.txid, language: Cryptpad.getLanguage(), localStore: window.localStore, cache: window.cpCache }));
 
                     // Then start the channel
                     window.addEventListener('message', function (msg) {