[empathy] Fix missing date icons in chat history window

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 5dc16e2a2c1d3f6fcbe318c1c67a3b02dc58f6c0
Author: Hussam Al-Tayeb <me hussam eu org>
Date:   Thu Oct 22 16:25:00 2015 -0500

    Fix missing date icons in chat history window
    
    use x-office-calendar icon instead
    
    https://bugzilla.gnome.org/show_bug.cgi?id=756990

 libempathy-gtk/empathy-log-window.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libempathy-gtk/empathy-log-window.c b/libempathy-gtk/empathy-log-window.c
index d58de82..b3a66e7 100644
--- a/libempathy-gtk/empathy-log-window.c
+++ b/libempathy-gtk/empathy-log-window.c
@@ -204,7 +204,7 @@ enum
   COL_EVENTS_COUNT
 };
 
-#define CALENDAR_ICON "stock_calendar"
+#define CALENDAR_ICON "x-office-calendar"
 
 /* Seconds between two messages to be considered one conversation */
 #define MAX_GAP 30*60