Update 30_update_plex.sh

Move to current Plex domain.  Plexapp.com has a 301 permanent redirect, but some users are not being re-directed.

init/30_update_plex.sh

@@ -21,7 +21,7 @@ if [[ "$VERSION" != "$INSTALLED" ]]; then
   echo "Upgradeing from version: $INSTALLED to version: $VERSION"
     while [[ $last -ne "0" ]]; do
 	  rm -f /tmp/plexmediaserver_*.deb
-	  wget -P /tmp "https://downloads.plexapp.com/plex-media-server/$VERSION/plexmediaserver_${VERSION}_amd64.deb"
+	  wget -P /tmp "https://downloads.plex.tv/plex-media-server/$VERSION/plexmediaserver_${VERSION}_amd64.deb"
 	  last=$?
 	done
 	apt-get remove --purge -y plexmediaserver