Fix burn after reading with onlyoffice

www/common/onlyoffice/inner.js

@@ -1395,6 +1395,10 @@ define([
                 Title.updateTitle(Title.defaultTitle);
             }
 
+            if (metadataMgr.getPrivateData().burnAfterReading && content && content.channel) {
+                sframeChan.event('EV_BURN_PAD', content.channel);
+            }
+
             openRtChannel(function () {
                 setMyId();
                 oldHashes = JSON.parse(JSON.stringify(content.hashes));

www/common/onlyoffice/main.js

@@ -64,8 +64,8 @@ define([
                 var owners, expire;
                 nThen(function (waitFor) {
                     if (Utils.rtConfig) {
-                        owners = Utils.rtConfig.owners;
-                        expire = Utils.rtConfig.expire;
+                        owners = Utils.Util.find(Utils.rtConfig, ['metadata', 'owners']);
+                        expire = Utils.Util.find(Utils.rtConfig, ['metadata', 'expire']);
                         return;
                     }
                     Cryptpad.getPadAttribute('owners', waitFor(function (err, res) {