Only animate y position of column once initialized

Change-Id: Id20dbd58ebac8f1e872efbfe0d566faeddc95534

qml/basic/Basic.qml

@@ -133,6 +133,7 @@ Item {
                 }
 
                 Behavior on y {
+                    enabled: artworkStack.initialized
                     NumberAnimation {
                         duration: Math.min(globalVars.adjustedInterval, basicSettings.animationDuration)
                         easing.type: basicSettings.easingType