[config] Check correct paramter in config_value_changed() predicate

The function compares old value with ini file section name, which leads
to practically every new value being evaluated different from previous one.

Check old value vs new value instead.

Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

src/usb_moded-config.c

@@ -362,7 +362,7 @@ int config_value_changed(GKeyFile *settingsfile, const char *entry, const char *
   char *old = g_key_file_get_string(settingsfile, entry, key, NULL);
   if (old)
   {
-	gboolean unchanged = (g_strcmp0(old, entry) == 0);
+	gboolean unchanged = (g_strcmp0(old, new_value) == 0);
         g_free(old);
         if (unchanged)
         {