minidlna: remove panasonic video grouping by directory patch

Unfortunately this is breaking sorting and causes some
issues with starting streams on various non-Panasonic
clients. Tested on 5 different models of 2014-2017
Samsung Smart TVs and BubbleUPnP for Android.
Removing this patch fixes sorting by filename and
clients no longer sometimes fail to load the streams.

Signed-off-by: James Christopher Adduono <jc@adduono.com>