sysutils/battray: Update from 2.1 to 2.3
Fixes this Python 3 issue on FreeBSD 11.1:
battray error: a bytes-like object is required, not 'str'
File "/usr/local/lib/python3.6/site-packages/battray/__init__.py", line 135, in update_status
self.data['lifetime']) = self.platform()
File "/usr/local/lib/python3.6/site-packages/battray/platforms.py", line 38, in freebsd
for line in o.split('\n'):PR: 222980
Reported by: bsd@mkfs.nl
MFH: 2017Q4