Remove obsolete test data from QFileInfo test.

Remove obsolete test data from QFileInfo test.

The removed data relied on the test's own source file having no write
permissions, but that is not a valid assumption -- in a source package
the file wouldn't have had write permissions, in Perforce it would have
depended on whether the file had been checked-out for editing and in git
the file would always have write permission.

Change-Id: I000596f122f2765f97a09a08074938c90e2e9f95
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>