fix websocket close wrapper

src/kemal/websocket.cr

@@ -43,16 +43,19 @@ module Kemal
           context.response.status_code = 500
 
           if error.is_a?(WebsocketError)
-            code = error.code.to_i16
+            code = error.code.to_i32
             message = error.status_message
           else
-            code = 1011_i16
+            code = 1011_i32
             message = "Exception"
           end
 
           raw = uninitialized UInt8[2]
           IO::ByteFormat::BigEndian.encode(code, raw.to_slice)
-          socket.not_nil!.close(String.new(raw.to_slice) + message)
+          socket.not_nil!.close(
+            HTTP::WebSocket::CloseCode.new(code),
+            message: String.new(raw.to_slice) + message
+          )
 
           raise error unless error.is_a?(WebsocketError)
         end