Don't set TextEditor class's schedule in AtomEnvironment constructor

We construct multiple AtomEnvironment instances in the tests. I don't
know how the tests ever worked with this code in there.

src/initialize-application-window.coffee

@@ -67,6 +67,7 @@ global.atom = new AtomEnvironment({
   enablePersistence: true
 })
 
+TextEditor.setScheduler(global.atom.views)
 global.atom.preloadPackages()
 
 # Like sands through the hourglass, so are the days of our lives.