refactor(ngSwitch):delete default directive restriction

delete the directive restriction to avoid code duplication
since the default is already applied

Closes #10987
Closes #11119

Author: diegofss11

src/ng/directive/ngSwitch.js

@@ -130,7 +130,6 @@
  */
 var ngSwitchDirective = ['$animate', function($animate) {
   return {
-    restrict: 'EA',
     require: 'ngSwitch',
 
     // asks for $scope to fool the BC controller module