QML UI: attempt to add dark theme

This isn't great, yet, but a first step to show that this is possible
(and in doing so I found quite a few spots where the colors weren't
correctly propagating, yet).

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

mobile-widgets/qml/Log.qml

@@ -30,6 +30,7 @@ Kirigami.ScrollablePage {
 		delegate : Text {
 			width: logWindow.width
 			wrapMode: Text.WrapAtWordBoundaryOrAnywhere
+			color: Kirigami.Theme.textColor
 			text : message
 		}
 	}