tvheadend: correct group permissions for /dev/dvb

Provide group read, write and execute permissions for /dev/dvb, otherwise
adapters will not be accessible from tvheadend.

Signed-off-by: Matthew Hagan <mnhagan88@gmail.com>

multimedia/tvheadend/files/dvb.hotplug

@@ -1,7 +1,7 @@
 #!/bin/sh
 case "$ACTION" in
   add)
-    chown -R root:dvb /dev/dvb/*
-    chmod -R 660 /dev/dvb/*
+    chgrp -R dvb /dev/dvb/*
+    chmod -R g+rwX /dev/dvb/*
     ;;
 esac

multimedia/tvheadend/files/tvheadend.init

@@ -80,7 +80,8 @@ start_service() {
 	ensure_config_exists
 	procd_open_instance
 	procd_set_param file /etc/config/tvheadend
-	chown -R root:$TVH_GROUP /dev/dvb/*
+	chgrp -R $TVH_GROUP /dev/dvb/*
+	chmod -R g+rwX /dev/dvb/*
 	procd_set_param command "$PROG" -B -u $TVH_USER -g $TVH_GROUP
 	load_uci_config
 	procd_close_instance