Update testcase for fetchpriority low in inital viewpoint and not vis…

…ible

plugins/image-prioritizer/tests/test-helper.php

@@ -287,9 +287,9 @@ public function data_provider_test_filter_tag_walker_visitors(): array {
 							<p>Pretend this is a super long paragraph that pushes the next image mostly out of the initial viewport.</p>
 							<img data-od-removed-fetchpriority="high" data-od-removed-loading="lazy" src="https://example.com/bar.jpg" alt="Bar" width="10" height="10"  >
 							<p>Now the following image is definitely outside the initial viewport.</p>
-							<img data-od-added-loading data-od-removed-fetchpriority="high" loading="lazy" src="https://example.com/baz.jpg" alt="Baz" width="10" height="10" >
-							<img data-od-removed-fetchpriority="high" data-od-replaced-loading="eager" src="https://example.com/qux.jpg" alt="Qux" width="10" height="10"  loading="lazy">
-							<img src="https://example.com/quux.jpg" alt="Quux" width="10" height="10" loading="lazy"><!-- This one is all good. -->
+							<img data-od-added-fetchpriority data-od-added-loading data-od-removed-fetchpriority="high" loading="lazy" src="https://example.com/baz.jpg" alt="Baz" width="10" height="10" fetchpriority="low">
+							<img data-od-added-fetchpriority data-od-removed-fetchpriority="high" data-od-replaced-loading="eager" src="https://example.com/qux.jpg" alt="Qux" width="10" height="10" fetchpriority="low" loading="lazy">
+							<img data-od-added-fetchpriority fetchpriority="low" src="https://example.com/quux.jpg" alt="Quux" width="10" height="10" loading="lazy"><!-- This one is all good. -->
 						</body>
 					</html>
 				',