main: don't explicitly hide the stage

It's hidden by default, so there's no point in hiding it explicitly.

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

js/ui/main.js

@@ -91,9 +91,6 @@ function start() {
     global.logError = window.log;
     global.log = window.log;
 
-    // Hide the stage until we're ready for it
-    global.stage.hide();
-
     // Chain up async errors reported from C
     global.connect('notify-error', function (global, msg, detail) { notifyError(msg, detail); });