Add test for disable-inline-width on amp-img

Author: westonruter

tests/php/test-tag-and-attribute-sanitizer.php

@@ -2452,6 +2452,11 @@ static function() {
 				null,
 			],
 
+			'disable-inline-width'                         => [
+				'<amp-img layout="intrinsic" height="160" width="480" disable-inline-width src="https://example.com/elva-fairy-800w.jpg" srcset="https://example.com/elva-fairy-480w.jpg 480w, https://example.com/elva-fairy-800w.jpg 800w" sizes="(max-width: 600px) 480px, 800px"></amp-img>',
+				null,
+			],
+
 			'amp-inline-gallery'                           => [
 				'
 				<amp-inline-gallery layout="container">