dashfolders: fix folder selection dropdown in dashboard settings

Use folder id from meta instead of dashboard object

public/app/features/dashboard/settings/settings.html

@@ -45,7 +45,7 @@
 			</bootstrap-tagsinput>
 		</div>
 		<folder-picker initial-title="ctrl.dashboard.meta.folderTitle"
-								 initial-folder-id="ctrl.dashboard.folderId"
+								 initial-folder-id="ctrl.dashboard.meta.folderId"
 				 on-change="ctrl.onFolderChange($folder)"
 		 label-class="width-7">
 		</folder-picker>