[folks] Don't synchronise groups between Personas

[Travis Reitter <treitter src gnome org>]

commit 6e1098f1f1651ca71666125cbe6b02bb86d11afd
Author: Philip Withnall <philip withnall collabora co uk>
Date:   Mon Aug 9 17:18:32 2010 +0100

    Don't synchronise groups between Personas

 folks/individual.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/folks/individual.vala b/folks/individual.vala
index 1a6806a..a2b0bc4 100644
--- a/folks/individual.vala
+++ b/folks/individual.vala
@@ -132,7 +132,7 @@ public class Folks.Individual : Object,
         {
           this._personas.foreach ((p) =>
             {
-              if (p is Groups)
+              if (p is Groups && ((Persona) p).store.is_writeable == true)
                 ((Groups) p).groups = value;
             });
         }