Remove hardcoded RTV in one of the amphtml ad examples. (#24209)

examples/amphtml-ads/adchoices-2.a4a.html

@@ -4,12 +4,12 @@
     <meta charset="utf-8">
     <meta content="width=device-width,minimum-scale=1,initial-scale=1" name="viewport">
     <meta content="noindex" name="robots">
-    <link as="script" href="https://cdn.ampproject.org/rtv/011904200955460/amp4ads-v0.js" rel="preload">
-    <script async="" src="https://cdn.ampproject.org/rtv/011904200955460/amp4ads-v0.js"></script>
-    <script async="" custom-element="amp-ad-exit" src="https://cdn.ampproject.org/rtv/011904200955460/v0/amp-ad-exit-0.1.js"></script>
-    <script async="" custom-element="amp-analytics" src="https://cdn.ampproject.org/rtv/011904200955460/v0/amp-analytics-0.1.js"></script>
-    <script async="" custom-element="amp-fit-text" src="https://cdn.ampproject.org/rtv/011904200955460/v0/amp-fit-text-0.1.js"></script>
-    <script async="" custom-element="amp-form" src="https://cdn.ampproject.org/rtv/011904200955460/v0/amp-form-0.1.js"></script>
+    <link as="script" href="https://cdn.ampproject.org/amp4ads-v0.js" rel="preload">
+    <script async="" src="https://cdn.ampproject.org/amp4ads-v0.js"></script>
+    <script async="" custom-element="amp-ad-exit" src="https://cdn.ampproject.org/v0/amp-ad-exit-0.1.js"></script>
+    <script async="" custom-element="amp-analytics" src="https://cdn.ampproject.org/v0/amp-analytics-0.1.js"></script>
+    <script async="" custom-element="amp-fit-text" src="https://cdn.ampproject.org/v0/amp-fit-text-0.1.js"></script>
+    <script async="" custom-element="amp-form" src="https://cdn.ampproject.org/v0/amp-form-0.1.js"></script>
     <link href="https://fonts.googleapis.com/css?family=Roboto:300|Roboto:400,500&amp;lang=en" rel="stylesheet" type="text/css">
     <link href="https://fonts.googleapis.com/css?family=Roboto:400,500&amp;text=" rel="stylesheet" type="text/css">
     <style amp-custom="">