[PlacesItemModelTest] Try to double test timeout

The randomly failing `testRefresh()` on the CI can be reproduced by
replacing the QTRY_COMPARE with a simple QCOMPARE.

So it seems the CI can be slow such that the default QTR_COMPARE
timeout of 5 seconds is not enough.

If a timeout of 10 seconds fixes this particular test case, we can use
this bigger timeout also in the other failing tests.