[evolution] Fix a typo which disabled "Always load images" option forever

[Milan Crha <mcrha src gnome org>]

commit 449889b31a97ad781b426a63b0a231998339f1c1
Author: Milan Crha <mcrha redhat com>
Date:   Fri Mar 22 12:03:39 2013 +0100

    Fix a typo which disabled "Always load images" option forever

 modules/mail/em-mailer-prefs.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/modules/mail/em-mailer-prefs.c b/modules/mail/em-mailer-prefs.c
index 469425f..52d6f7f 100644
--- a/modules/mail/em-mailer-prefs.c
+++ b/modules/mail/em-mailer-prefs.c
@@ -1032,7 +1032,7 @@ em_mailer_prefs_construct (EMMailerPrefs *prefs,
        gtk_toggle_button_set_active (
                GTK_TOGGLE_BUTTON (widget),
                val == E_MAIL_IMAGE_LOADING_POLICY_ALWAYS);
-       gtk_widget_set_sensitive (widget, FALSE);
+       gtk_widget_set_sensitive (widget, writable);
 
        g_signal_connect (
                widget, "toggled",