Revert "Defer initializing UI until after the global session has loaded"

This reverts commit 0bef925b51.

Just for now.  Jasper has plans to clean up start up eventually.

https://bugzilla.gnome.org/show_bug.cgi?id=694321

js/ui/sessionMode.js

@@ -158,7 +158,12 @@ function listModes() {
 const SessionMode = new Lang.Class({
     Name: 'SessionMode',
 
-    init: function() {
+    _init: function() {
+        global.connect('notify::session-mode', Lang.bind(this, this._sync));
+        this._modes = _modes;
+        this._modeStack = [DEFAULT_MODE];
+        this._sync();
+
         _getModes(Lang.bind(this, function(modes) {
             this._modes = modes;
             let primary = modes[global.session_mode] &&
@@ -166,8 +171,6 @@ const SessionMode = new Lang.Class({
             let mode = primary ? global.session_mode : 'user';
             this._modeStack = [mode];
             this._sync();
-
-            this.emit('sessions-loaded');
         }));
     },