Welcomescreen: Pixel aligned scrolling

Avoid blurry images.

Task-Number: QTBUG-36297
Change-Id: Icd8c62b40f976dec71a39e64ad6a0c14f3df4fbe
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>

share/qtcreator/welcomescreen/welcomescreen.qml

@@ -36,6 +36,9 @@ ScrollView {
 
     property var fonts: CustomFonts {}
     property var colors: CustomColors { }
+
+    flickableItem.pixelAligned: true
+
     Rectangle {
         width: Math.max(920, scrollView.flickableItem.width - 30)
         height: Math.max(loader.height, scrollView.flickableItem.height);