Fixed Slack notifications

- Slack got rid of the .unread_msgs and .unread_highlights selectors
- This uses the selectors currently available to determine if there
  are any unreads, as well as the selector on the highlight badge
  to find a count of unread highlights.

app/store/ServicesList.js

@@ -38,7 +38,7 @@ Ext.define('Rambox.store.ServicesList', {
 			,description: locale['services[1]']
 			,url: 'https://___.slack.com/'
 			,type: 'messaging'
-			,js_unread: 'function checkUnread(){var a=0,b=0;$(".unread_msgs").each(function(){a+=isNaN(parseInt($(this).html())) ? 0 : parseInt($(this).html())}),$(".unread_highlights").each(function(){b+=isNaN(parseInt($(this).html())) ? 0 : parseInt($(this).html())}),updateBadge(a,b)}function updateBadge(a,b){var c=b>0?"("+b+") ":a>0?"(•) ":"";document.title=c+originalTitle}var originalTitle=document.title;setInterval(checkUnread,3000);'
+			,js_unread: 'function checkUnread(){var e=$(".p-channel_sidebar__channel--unread").length,a=0;$(".p-channel_sidebar__badge").each(function(){a+=isNaN(parseInt($(this).html()))?0:parseInt($(this).html())}),updateBadge(e,a)}function updateBadge(e,a){var n=a>0?"("+a+") ":e>0?"(•) ":"";document.title=n+originalTitle}var originalTitle=document.title;setInterval(checkUnread,3e3);'
 		},
 		{
 			 id: 'noysi'