Remove check of model state in DurationCalculation

We no longer need this check, because it was only relevant with Ember
Data. Additionally it was a cause of a travis-ci/travis-ci#1992, because
of wrong syntax:

    unless someFunction false or true

will only check for a result of someFunction with an argument being the
result of `or` expression.

assets/scripts/app/models/extensions.coffee

@@ -7,6 +7,6 @@ Travis.DurationCalculations = Ember.Mixin.create
   ).property('_duration', 'finishedAt', 'startedAt')
 
   updateTimes: ->
-    unless ['rootState.loaded.reloading', 'rootState.loading'].contains @get('stateManager.currentState.path') or @get('isFinished')
+    unless @get('isFinished')
       @notifyPropertyChange '_duration'
       @notifyPropertyChange 'finished_at'