Show options for .m.rule.tombstone push rules

Part of vector-im/riot-web#8447

src/components/views/settings/Notifications.js

@@ -507,6 +507,7 @@ module.exports = React.createClass({
                 //'.m.rule.member_event': 'vector',
                 '.m.rule.call': 'vector',
                 '.m.rule.suppress_notices': 'vector',
+                '.m.rule.tombstone': 'vector',
 
                 // Others go to others
             };
@@ -562,6 +563,7 @@ module.exports = React.createClass({
                 //'im.vector.rule.member_event',
                 '.m.rule.call',
                 '.m.rule.suppress_notices',
+                '.m.rule.tombstone',
             ];
             for (const i in vectorRuleIds) {
                 const vectorRuleId = vectorRuleIds[i];