[QUA]Fix tests for activity places (bad import)

golem_activity_place/tests/__init__.py

@@ -15,4 +15,4 @@
 #    You should have received a copy of the GNU Affero General Public License
 #    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-from . import test_golem_activity_session
+from . import test_golem_activity