Added chown for plex user in omv

When using omv and plex, the plex user and group needs to own the media (not sure if this is actually true, but it works for me). For PUID and GUID in docker containers use 997 and 994.

fix_perm.sh

@@ -1,3 +1,6 @@
 #!/bin/bash
 
-chmod -R u=rwx,g=rx,o=rx "$1"
+folder="$1"
+
+chown -R plex:plex $folder
+chmod -R u=rwx,g=rx,o=rx $folder