[folks] Don't use deprecated Gee.Map.remove() method

[Philip Withnall <pwithnall src gnome org>]

commit 5cd2f5278a2be05bb561759f5d0737bf0427a2dd
Author: Philip Withnall <philip withnall collabora co uk>
Date:   Thu Aug 26 22:27:02 2010 +0100

    Don't use deprecated Gee.Map.remove() method

 folks/individual.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/folks/individual.vala b/folks/individual.vala
index f798396..9a644bf 100644
--- a/folks/individual.vala
+++ b/folks/individual.vala
@@ -328,7 +328,7 @@ public class Folks.Individual : Object,
         this.personas_changed (null, removed_personas);
 
       if (store != null)
-        this.stores.remove (store);
+        this.stores.unset (store);
 
       if (this._persona_set.size < 1)
         {