Query filter block: Update HTML directive with correct name

At some point, `wp-effect` was changed to `wp-watch`, so these callbacks had not been firing. This fixes the name so the focus and positioning callbacks run when the modal opens.

mu-plugins/blocks/query-filter/render.php

@@ -99,8 +99,8 @@ class="wporg-query-filter__modal-backdrop"
 		class="<?php echo esc_attr( implode( ' ', $modal_classes ) ); ?>"
 		id="<?php echo esc_attr( $html_id ); ?>"
 		data-wp-bind--hidden="!context.isOpen"
-		data-wp-effect--focus="effects.focusFirstElement"
-		data-wp-effect--position="effects.checkPosition"
+		data-wp-watch--focus="effects.focusFirstElement"
+		data-wp-watch--position="effects.checkPosition"
 	>
 		<form
 			action="<?php echo esc_attr( $settings['action'] ); ?>"