Speed up Gallery example
Speed up Gallery example

There is no need to create 4000 items in an example.

Change-Id: I8cdc9aaee08abe43c951e66bf2f5a7e837455fb9
Reviewed-by: Jens Bache-Wiig <9cea9d70b08f8210134ec5959114f72bad51ed1d@digia.com>

mizukusak/qtquickcontrols,kobolabs/qtquickcontrols,jfaust/qtquickcontrols,mizukusak/qtquickcontrols,mizukusak/qtquickcontrols,drgvond/qtquickcontrols,richardmg/qtcomponents,drgvond/qtquickcontrols,richardmg/qtcomponents,drgvond/qtquickcontrols,kobolabs/qtquickcontrols,kobolabs/qtquickcontrols,richardmg/qtcomponents,jfaust/qtquickcontrols,jfaust/qtquickcontrols