Query Loop: Remove is_singular() check and fix test (#65483)

* Replace query_posts() with set()

* Fix test_rendering_post_template_with_main_query_loop_already_started test

* Remove is_singular check

Co-authored-by: mikachan <mikachan@git.wordpress.org>
Co-authored-by: jffng <jffng@git.wordpress.org>
Co-authored-by: David Herrera <697432+dlh01@users.noreply.github.com>

packages/block-library/src/post-template/index.php

@@ -64,11 +64,6 @@ function render_block_core_post_template( $attributes, $content, $block ) {
 		if ( in_the_loop() ) {
 			$query = clone $wp_query;
 			$query->rewind_posts();
-
-			// If in a single post of any post type, default to the 'post' post type.
-			if ( is_singular() ) {
-				query_posts( array( 'post_type' => 'post' ) );
-			}
 		} else {
 			$query = $wp_query;
 		}

phpunit/blocks/render-post-template-test.php

@@ -122,7 +122,7 @@ public function test_rendering_post_template_with_main_query_loop_already_starte
 		global $wp_query, $wp_the_query;
 
 		// Query block with post template block.
-		$content  = '<!-- wp:query {"query":{"inherit":true}} -->';
+		$content  = '<!-- wp:query {"query":{"inherit":false}} -->';
 		$content .= '<!-- wp:post-template {"align":"wide"} -->';
 		$content .= '<!-- wp:post-title /-->';
 		$content .= '<!-- /wp:post-template -->';