Fix scrolling quirk in email preview frame using Opera 12 (#1488763)

CHANGELOG

@@ -1,6 +1,7 @@
 CHANGELOG Roundcube Webmail
 ===========================
 
+- Fix scrolling quirk in email preview frame using Opera 12 (#1488763)
 - Fix displaying of multipart/alternative messages with empty parts (#1488750)
 - Fix Warning: htmlspecialchars(): charset `RCMAIL_CHARSET' not supported warning in Installer (#1488744)
 - Fix threaded list sorting on PHP < 5.2.9 (#1488748)

skins/classic/mail.css

@@ -299,7 +299,6 @@
   bottom: 0px;
   border: 1px solid #999999;
   background-color: #F9F9F9;
-  overflow: hidden;
 }
 
 #messagecontframe
@@ -359,7 +358,6 @@
   bottom: 0;
   border: 1px solid #999;
   background-color: #F9F9F9;
-  overflow: hidden;
 }
 
 #mailboxlist