fix(playlist): remove start button from edit page

public/app/features/playlist/partials/playlist.html

@@ -106,10 +106,6 @@
 
   <div class="pull-left" style="margin-top: 25px;">
     <!-- <div class="tight-form"> -->
-      <button type="button"
-              class="btn btn-success"
-              ng-disabled="playlistEditForm.$invalid || isPlaylistEmpty()"
-              ng-click="startPlaylist(playlist, dashboards)">Start</button>
       <button type="button"
               class="btn btn-success"
               ng-disabled="playlistEditForm.$invalid || isPlaylistEmpty()"

public/app/features/playlist/playlist_edit_ctrl.js

@@ -98,10 +98,6 @@ function (angular, config, _) {
       return !$scope.playlist.id;
     };
 
-    $scope.startPlaylist = function(playlist, dashboards) {
-      playlistSrv.start(dashboards, playlist.timespan);
-    };
-
     $scope.isPlaylistEmpty = function() {
       return !$scope.playlistItems.length;
     };