Expose whether we can lock the screen in the powermanagement data engine

This allows the lock logout applet and toolbox to access this information easily
since they already use this engine anyway

dataengines/powermanagement/powermanagementengine.cpp

@@ -29,6 +29,7 @@
 #include <solid/powermanagement.h>
 
 #include <klocalizedstring.h>
+#include <KAuthorized>
 #include <KIdleTime>
 
 #include <QDebug>
@@ -216,6 +217,7 @@ bool PowermanagementEngine::sourceRequestEvent(const QString &name)
         setData("Sleep States", "Suspend", sleepstates.contains(Solid::PowerManagement::SuspendState));
         setData("Sleep States", "Hibernate", sleepstates.contains(Solid::PowerManagement::HibernateState));
         setData("Sleep States", "HybridSuspend", sleepstates.contains(Solid::PowerManagement::HybridSuspendState));
+        setData("Sleep States", "LockScreen", KAuthorized::authorizeKAction("lock_screen"));
     } else if (name == "PowerDevil") {
         QDBusMessage screenMsg = QDBusMessage::createMethodCall(SOLID_POWERMANAGEMENT_SERVICE,
                                                               QStringLiteral("/org/kde/Solid/PowerManagement/Actions/BrightnessControl"),