466a0143-ls19

LinuxServer Changes:

Rebase to Alpine 3.9, fix init logic to only chown once.
tvheadend Changes:

en50221: fix menu text decoding

getmenutext() checks that dvb_get_string() returns greater than 0, but
that function returns 0 on success.

This causes menu text decoding to always fail, resulting in no menu
texts.

Fix the check to match dvb_get_string() behavior.