Update class-wp-odoo-form-integrator-admin.php

php8 compatibility
cf. coderscom#3

admin/class-wp-odoo-form-integrator-admin.php

@@ -419,7 +419,7 @@ public function display_plugin_integrated_forms_page() {
 		$result = $wpdb->get_row($sql);
 		$rec_count = $result->total;
 		if( isset($_GET{'pageno'} ) ) {
-	        $page = $_GET{'pageno'}-1;
+	        $page = $_GET['pageno']-1;
 	        $offset = $rec_limit * $page ;
 	    }else {
 	        $page = 0;