[frogr] Fix typo in '64x64' icon size

[Mario Sanchez Prada <msanchez src gnome org>]

commit 743ebcf10054fba32962b0b38d1d8e7b0c9dea71
Author: Mario Sanchez Prada <msanchez gnome org>
Date:   Sun Jun 8 00:00:26 2014 +0100

    Fix typo in '64x64' icon size

 src/frogr-main-view.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/frogr-main-view.c b/src/frogr-main-view.c
index 097138e..9814d8f 100644
--- a/src/frogr-main-view.c
+++ b/src/frogr-main-view.c
@@ -283,7 +283,7 @@ static void _update_ui (FrogrMainView *self);
 /* Private API */
 
 static  const gchar *icon_sizes[] = {
-  "128x128", "64X64", "48x48", "32x32", "24x24", "16x16"
+  "128x128", "64x64", "48x48", "32x32", "24x24", "16x16"
 };
 
 static GActionEntry app_entries[] = {