TCP: fix indent and reorder Multipath TCP

Change-Id: I4ebe474f2a2787c350fe8c4a2de5c35d94d9b064
Reviewed-on: https://code.wireshark.org/review/6032
Reviewed-by: Matthieu Coudron <mattator@gmail.com>
Reviewed-by: Michael Mann <mmann78@netscape.net>