Clean up imports (missed one)

tests/test_gui/test_gui_projtree.py

@@ -19,9 +19,10 @@ You should have received a copy of the GNU General Public License
 along with this program. If not, see <https://www.gnu.org/licenses/>.
 """
 
-from pathlib import Path
 import pytest
 
+from pathlib import Path
+
 from tools import C, buildTestProject
 from mocked import causeOSError