Welcomepage: session list should not be flickable

Change-Id: I663c6634960ac7704648f8fd01d85b349a0ef19d
Reviewed-by: Daniel Teske <daniel.teske@digia.com>

share/qtcreator/welcomescreen/widgets/Sessions.qml

@@ -45,6 +45,7 @@ Item {
         snapMode: ListView.SnapToItem
         spacing: 4
         clip: true
+        interactive: false
 
         delegate: SessionItem {
             function fullSessionName()