fixes wielebenwir#1725: speed up warmupCache(): search shortcodes onl…

…y on published post_type=page|s

Before this fix all kinds of (irrelevant) post_type|s were searched (revision, cb_booking, ...)

src/Service/Cache.php

@@ -251,11 +251,13 @@ public static function warmupCache() {
 
 			// First get all pages with cb shortcodes
 			$sql = "SELECT post_content FROM $table_posts WHERE 
-		      post_content LIKE '%cb_items%' OR
+			 (post_content LIKE '%cb_items%' OR
 			  post_content LIKE '%cb_locations%' OR
-		      post_content LIKE '%cb_map%' OR
+			  post_content LIKE '%cb_map%' OR
 			  post_content LIKE '%cb_items_table%' OR
-			  post_content LIKE '%cb_bookings%'";
+			  post_content LIKE '%cb_bookings%') AND
+			  post_type LIKE 'page' AND
+			  post_status LIKE 'publish'";
 			$pages = $wpdb->get_results( $sql );
 
 			// Now extract shortcode calles incl. attributes