Modernize widget-touch snippet
Modernize widget-touch snippet

Don't use practices, which are not encouraged in Tabris 2.x anymore,
e.g. using property setters/getters instead of fields and utilizing the
layoutData property.

Change-Id: I38e014b79c7b6fc30a2f1957b426152e31ddb7eb
eclipsesource/tabris-js,eclipsesource/tabris-js,eclipsesource/tabris-js