Stabilize tst_qquickpathview

The complete flick is already a long operation, so when it's delayed due
to heavy system load it can exceed 5s easily. Increase the timeout to
give the flick time to finish.

Change-Id: I333c41ea432676a8c7f6de637f6af98203cd07fb
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>