BATMAN: fix indent and encoding args

use tabs for indent and use fix-encoding-args tools

Change-Id: I5e066c6cbc429021cf21a55d5ffd5b60718ad5f8
Reviewed-on: https://code.wireshark.org/review/5340
Reviewed-by: Michael Mann <mmann78@netscape.net>
Reviewed-by: Evan Huus <eapache@gmail.com>