remove prologues where DI is not necessary

Author: jakemmarsh

app/js/controllers/example.js

@@ -1,7 +1,6 @@
 'use strict';
 
 function ExampleCtrl() {
-  'ngInject';
 
   // ViewModel
   const vm = this;

app/js/directives/example.js

@@ -1,7 +1,6 @@
 'use strict';
 
 function ExampleDirective() {
-  'ngInject';
 
   return {
     restrict: 'EA',

app/js/filters/example.js

@@ -1,7 +1,6 @@
 'use strict';
 
 function ExampleFilter() {
-  'ngInject';
 
   return function(input) {
     return input.replace(/keyboard/ig,'leopard');