[backends/drm] Fix typo

Thanks to kbroulik for noticing that I really, really should bye a
new keyboard as it's eating my "p" key.

backends/drm/drm_backend.cpp

@@ -96,7 +96,7 @@ bool DpmsInputEventFilter::keyEvent(QKeyEvent *event)
 void DpmsInputEventFilter::notify()
 {
     // queued to not modify the list of event filters while filtering
-    QMetaObject::invokeMethod(m_backend, "turnOututsOn", Qt::QueuedConnection);
+    QMetaObject::invokeMethod(m_backend, "turnOutputsOn", Qt::QueuedConnection);
 }
 
 DrmBackend::DrmBackend(QObject *parent)
@@ -154,7 +154,7 @@ void DrmBackend::outputWentOff()
     input()->prepandInputEventFilter(m_dpmsFilter.data());
 }
 
-void DrmBackend::turnOututsOn()
+void DrmBackend::turnOutputsOn()
 {
     m_dpmsFilter.reset();
     for (auto it = m_outputs.constBegin(), end = m_outputs.constEnd(); it != end; it++) {

backends/drm/drm_backend.h

@@ -94,7 +94,7 @@ public:
     void checkOutputsAreOn();
 
 public Q_SLOTS:
-    void turnOututsOn();
+    void turnOutputsOn();
 
 
 Q_SIGNALS: