sync-exclude: add .Spotlight-V100

The .Spotlight-V100 is added by macOS's Spotlight indexer to external
volumes. NextCloud fails to sync when this file exists. So, ignore it.

Signed-off-by: Brandon Philips <brandon@ifup.org>

sync-exclude.lst

@@ -22,6 +22,7 @@ System Volume Information
 ].Trash-*
 .fseventd
 .apdisk
+.Spotlight-V100
 
 .directory