Assembler: Fixing minor issues (#7555)

* Update template-page-w-title.php

Add strict type declaration.

* Update theme.json

Add comments template part declaration.

assembler/patterns/template-page-w-title.php

@@ -6,6 +6,7 @@
  * Viewport width: 1400
  * Inserter: no
  */
+declare( strict_types = 1 );
 ?>
 
 <!-- wp:template-part {"slug":"header"} /-->

assembler/theme.json

@@ -390,6 +390,11 @@
 		}
 	},
 	"templateParts": [
+		{
+			"area": "uncategorized",
+			"name": "comments",
+			"title": "Comments"
+		},
 		{
 			"area": "header",
 			"name": "header",