Do not start timers in QDeclarativePixmapStore teardown
Do not start timers in QDeclarativePixmapStore teardown

The store instance is a global static and so starting timers
during its destruction is unnecessary, and may cause crashes
if the QAbstractEventDispatcher's statics are already destroyed.
This happens on OS X at least.

Change-Id: I785515c8973b291a7bfc6c5dabe2c19e8393c7ad
Reviewed-by: Martin Jones <d1da02505c7f228af82a23235becb435f45569f5@nokia.com>

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