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