style(playlists): use backendsrv direct

There is no point resolving the playlists in the routes file.
Loading playlists is what the controller is suppose to do

public/app/features/playlist/playlist_routes.js

@@ -12,12 +12,7 @@ function (angular, config, _) {
     $routeProvider
       .when('/playlists', {
         templateUrl: 'app/features/playlist/partials/playlists.html',
-        controller : 'PlaylistsCtrl',
-        resolve: {
-          playlists: function (backendSrv) {
-            return backendSrv.get('/api/playlists');
-          }
-        }
+        controller : 'PlaylistsCtrl'
       })
       .when('/playlists/create', {
         templateUrl: 'app/features/playlist/partials/playlist.html',

public/app/features/playlist/playlists_ctrl.js

@@ -8,13 +8,11 @@ function (angular, _) {
   var module = angular.module('grafana.controllers');
 
   module.controller('PlaylistsCtrl', function(
-    playlists,
     $scope,
     $location,
     backendSrv
   ) {
-
-    $scope.playlists = playlists;
+    $scope.playlists = backendSrv.get('/api/playlists');
 
     $scope.playlistUrl = function(playlist) {
       return '/playlists/play/' + playlist.id;
@@ -26,14 +24,14 @@ function (angular, _) {
       modalScope.playlist = playlist;
       modalScope.removePlaylist = function() {
         modalScope.dismiss();
-        _.remove(playlists, {id: playlist.id});
+        _.remove($scope.playlists, {id: playlist.id});
 
         backendSrv.delete('/api/playlists/' + playlist.id)
           .then(function() {
             $scope.appEvent('alert-success', ['Playlist deleted', '']);
           }, function() {
             $scope.appEvent('alert-error', ['Unable to delete playlist', '']);
-            playlists.push(playlist);
+            $scope.playlists.push(playlist);
           });
       };