Replace DELETE FROM to TRUNCATE to empty woocommerce_sessions table

If the size of the woocommerce_sessions table is 3.2 GB before the
Clear all sessions button is clicked, then it will delete all rows, but
leave the table size 3.2. Truncating/emptying the table resets the size
of the table, and deletes all rows.

includes/admin/class-wc-admin-status.php

@@ -95,7 +95,7 @@ class WC_Admin_Status {
 				break;
 				case 'clear_sessions' :
 
-					$wpdb->query( "DELETE FROM {$wpdb->prefix}woocommerce_sessions" );
+					$wpdb->query( "TRUNCATE {$wpdb->prefix}woocommerce_sessions" );
 
 					wp_cache_flush();