修改ke：issue描述只有一行，点击编辑后，描述框被拉高了，有很多空白

public/assets/kindeditor/plugins/autoheight/autoheight.js

@@ -41,7 +41,7 @@ KindEditor.plugin('autoheight', function(K) {
         var body = edit.doc.body;
         edit.iframe.height(minHeight);
         self.resize(null, Math.max(
-                ((K.IE ? body.scrollHeight : body.offsetHeight) > 500 ? 500 : (K.IE ? body.scrollHeight : body.offsetHeight)) //限制初始化太高的情况
+                ((K.IE ? body.scrollHeight : body.offsetHeight) > 250 ? 250 : (K.IE ? body.scrollHeight : body.offsetHeight)) //限制初始化太高的情况
                 + 33, minHeight));
 	}