datastore: allow browsing signed pxar files

just because we can't verify the signature, does not mean the contents
are not accessible. it might make sense to make it obvious with a hint
or click-through warning that no signature verification can take place
or this and downloading.

Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>

www/DataStoreContent.js

@@ -505,7 +505,7 @@ Ext.define('PBS.DataStoreContent', {
 			return !(data.leaf &&
 			    data.filename &&
 			    data.filename.endsWith('pxar.didx') &&
-			    data['crypt-mode'] < 2);
+			    data['crypt-mode'] < 3);
 		    }
 		},
 	    ]