Fix snake demo.
Fix snake demo.

A surrounding Item {} appeared for no clear reason.

Task-number: QTBUG-26198
Change-Id: I1ddb7cc92c5ba977d85d3047c405a90cfe697a13
Reviewed-by: Yunqiao Yin <25fb2aad3521dfc99c20c23480a10158b6555533@nokia.com>

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