Tweak app for RPi 2 usage

Change-Id: I6ca1a60e38520170ac4b52319d0def8f62260a1f

main.qml

@@ -12,7 +12,7 @@ Window {
 
     Settings {
         id: settings
-        property int columnCount: 4
+        property int columnCount: 30
         property int interval: 30
         property bool fitByHeight: false
         property double pace: 1.0