修复模板LOG还原的BUG

app/Admin/Controllers/DistAppearanceTemplateController.php

@@ -78,6 +78,7 @@ class DistAppearanceTemplateController extends AdminController
                 //返回模版修改日志内容
                 $logId = $request->get('log_id');
                 $rows = DistAppearanceTemplateLog::fetchTemplateLogContent($logId);
+                $rows->previous_content = htmlspecialchars($rows->previous_content);
                 return response()->json($rows);
             } else if ($request->get('act') == 'restore_template_log') {
                 //还原模版修改日志