Add default layout to Geologist single posts (#5144)

geologist/block-templates/single.html

@@ -3,7 +3,7 @@
 <!-- wp:group {"tagName":"main"} -->
 <main class="wp-block-group">
 
-	<!-- wp:group -->
+	<!-- wp:group {"layout":{"inherit":true}} -->
 	<div class="wp-block-group">
 		<!-- wp:post-title {"textAlign":"left","level":1,"style":{"spacing":{"margin":{"bottom":"calc(2 * var(--wp--style--block-gap))"}}}} /-->
 		<!-- wp:post-featured-image {"style":{"spacing":{"margin":{"top":"calc(2 * var(--wp--style--block-gap))"}}}} /-->