Invert display and lockscreen control dependencies

lockscreen/lockscreen.go

@@ -6,8 +6,11 @@ import (
 )
 
 
+// XDG uses qdbus to monitor the freedesktop screensaver status
+type XDG struct {}
+
 // IsActive checks whether the screen is locked (checks if the screensaver is active)
-func IsActive() (bool, error) {
+func (XDG) IsActive() (bool, error) {
 	cmd := exec.Command("qdbus",
 		"org.kde.screensaver",
 		"/ScreenSaver",