Fix for issue codeigniter4#612

This fixes an issue with route groups and route options not merging correctly.

system/Router/RouteCollection.php

@@ -1117,10 +1117,7 @@ protected function create(string $from, $to, array $options = null)
 			$from = trim($from, '/');
 		}
 
-		if (is_null($options))
-		{
-			$options = $this->currentOptions;
-		}
+		$options = array_merge((array)$this->currentOptions, (array)$options);
 
 		// Hostname limiting?
 		if (isset($options['hostname']) && ! empty($options['hostname']))