utils: Remove 24h utility function

The last user of this function is gone now.

src/utils/gcal-utils.c

@@ -559,29 +559,6 @@ icaltime_compare_with_current (const ICalTime *date1,
   return result;
 }
 
-/**
- * is_clock_format_24h:
- *
- * Retrieves whether the current clock format is
- * 12h or 24h based.
- *
- * Returns: %TRUE if the clock format is 24h, %FALSE
- * otherwise.
- */
-gboolean
-is_clock_format_24h (void)
-{
-  static GSettings *settings = NULL;
-  g_autofree gchar *clock_format = NULL;
-
-  if (!settings)
-    settings = g_settings_new ("org.gnome.desktop.interface");
-
-  clock_format = g_settings_get_string (settings, "clock-format");
-
-  return g_strcmp0 (clock_format, "24h") == 0;
-}
-
 /**
  * e_strftime_fix_am_pm:
  *

src/utils/gcal-utils.h

@@ -83,8 +83,6 @@ gint                 icaltime_compare_with_current               (const ICalTime
                                                                   const ICalTime *date2,
                                                                   time_t         *current_time_t);
 
-gboolean             is_clock_format_24h                         (void);
-
 /* code brought from evolution */
 gsize                e_strftime_fix_am_pm                        (gchar              *str,
                                                                   gsize               max,