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/atom-environment.js

@@ -71,7 +71,6 @@ class AtomEnvironment {
     this.deserializers = new DeserializerManager(this)
     this.deserializeTimings = {}
     this.views = new ViewRegistry(this)
-    TextEditor.setScheduler(this.views)
     this.notifications = new NotificationManager()
 
     this.stateStore = new StateStore('AtomEnvironments', 1)

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.

src/initialize-test-window.coffee

@@ -82,6 +82,7 @@ module.exports = ({blobStore}) ->
       params.onlyLoadBaseStyleSheets = true unless params.hasOwnProperty("onlyLoadBaseStyleSheets")
       atomEnvironment = new AtomEnvironment(params)
       atomEnvironment.initialize(params)
+      TextEditor.setScheduler(atomEnvironment.views)
       atomEnvironment
 
     promise = testRunner({