ColorDevice: Always update on creation

ColorDevice gets recreated when outputs get removed and added back. This
means the output can be in an unknown state that does not match the
values in ColorDevice. So ensure we update after creating the device to
set it to a known proper state.

colordevice.cpp

@@ -272,6 +272,7 @@ ColorDevice::ColorDevice(AbstractOutput *output, QObject *parent)
     connect(d->updateTimer, &QTimer::timeout, this, &ColorDevice::update);
 
     d->output = output;
+    scheduleUpdate();
 }
 
 ColorDevice::~ColorDevice()