Fix KFilePlacesModelTest failure

KFilePlacesModelTest uses data from
solid/backends/fakehw/fakecomputer.xml. That file was modified in commit
75a0eb52, causing the test to fail because the new place "/media/nfs"
was not taken into account. This commit fixes the failures by adding
that place to the list of expected URLs and changing the rows of some
inserted and changed QModelIndexes by 1.


REVIEW: 101381