Remove invalid check from test_projectload test.

Summary:
This check implies that newly allocated `projectItem` will be placed
in different memory region, but it isn't always so. On FreeBSD, reloading the
project occupies the same memory region, so this check fails.

Reviewers: #kdevelop, apol

Reviewed By: #kdevelop, apol

Subscribers: kdevelop-devel

Tags: #kdevelop

Differential Revision: https://phabricator.kde.org/D22350