From: Nutchanon Wetchasit <nachanon@users.noreply.github.com>
Subject: Acknowledge changes in AC backlight GSettings when running on battery
Bug: https://github.com/mate-desktop/mate-power-manager/issues/166

--- a/src/gpm-backlight.c
+++ b/src/gpm-backlight.c
@@ -380,7 +380,7 @@
 		      "on-battery", &on_battery,
 		      NULL);
 
-	if (!on_battery && g_strcmp0 (key, GPM_SETTINGS_BRIGHTNESS_AC) == 0) {
+	if (g_strcmp0 (key, GPM_SETTINGS_BRIGHTNESS_AC) == 0) {
 		backlight->priv->master_percentage = g_settings_get_double (settings, key);
 		gpm_backlight_brightness_evaluate_and_set (backlight, FALSE, TRUE);