Close keyboard shortcuts modal on alt+ctrl+h again.

app/assets/javascripts/app/controllers/keyboard_shortcurs.coffee

@@ -11,6 +11,8 @@ class Index extends App.ControllerModal
 
     return if !@authenticate()
 
+    @bind('keyboard_shortcuts_close', @close)
+
   content: ->
     App.view('keyboard_shortcuts')(
       areas: App.Config.get('keyboard_shortcuts')

app/assets/javascripts/app/controllers/widget/keyboard_shortcuts.coffee

@@ -73,6 +73,9 @@ App.Config.set(
               hotkeys: true
               description: 'List of shortcuts'
               callback: ->
+                if window.location.hash is '#keyboard_shortcuts'
+                  App.Event.trigger('keyboard_shortcuts_close')
+                  return
                 window.location.hash = '#keyboard_shortcuts'
             }
             {