fix(route): dekudeals error due to ad

[DexterTheDragon]

该 PR 相关 Issue / Involved issue

N/A

完整路由地址 / Example for the proposed route(s)

/dekudeals/most-wanted 

说明 / Note

An ad on the page causes an error when generating the feed. This changes the selector to only get the game items and ignore the ad.

Ad in middle of page:

Error:

[github-actions]

Successfully generated as following:

https://rsshub-en0n4qe65-diy.vercel.app/dekudeals/most-wanted - Success

    <?xml version="1.0" encoding="UTF-8"?>
<rss  xmlns:atom="http://www.w3.org/2005/Atom" version="2.0"

>
    <channel>
        <title><![CDATA[
Most Wanted
—dekudeals]]></title>
        <link>https://www.dekudeals.com/most-wanted</link>
        <atom:link href="https://rsshub-en0n4qe65-diy.vercel.app/dekudeals/most-wanted" rel="self" type="application/rss+xml" />
        <description><![CDATA[
Most Wanted
—dekudeals - Made with love by RSSHub(https://github.com/DIYgod/RSSHub)]]></description>
        <generator>RSSHub</generator>
        <webMaster>[email protected] (DIYgod)</webMaster>
        
        
        
        <language>zh-cn</language>
        
        <lastBuildDate>Sat, 18 Sep 2021 17:06:05 GMT</lastBuildDate>
        <ttl>5</ttl>
        
        <item>
            <title><![CDATA[The Legend of Zelda: Link’s Awakening]]></title>
            <description><![CDATA[<img src="https://cdn.dekudeals.com/images/3ce6bc2cc97d15372d8abd06b5f5f0de689153ae/w500.jpg" referrerpolicy="no-referrer"><br><s>$59.99</s><br>$49.94]]></description>
            
            <guid isPermaLink="false">https://www.dekudeals.com/items/the-legend-of-zelda-links-awakening</guid>
            <link>https://www.dekudeals.com/items/the-legend-of-zelda-links-awakening</link>