Update html-head.html

Author: Cobra-Bitcoin

_includes/layout/base/html-head.html

@@ -20,7 +20,7 @@
 <script src="/js/jquery/jquery-1.11.2.min.js"></script>
 <script src="/js/jquery/jquery-ui.min.js"></script>
 <script src="/js/jquery/jquery.qrcode.min.js"></script>
-{% if page.id == "buy" %}
+{% if page.id == "buy" or page.id == "sell" %}
 <script src="https://static.moonpay.com/web-sdk/v1/moonpay-web-sdk.min.js"></script>
 {% endif %}
 <link rel="shortcut icon" href="/favicon.png?{{site.time | date: '%s'}}">