A team can't accept a problem that was previously *accepted* not the last purposed

Signed-off-by: Emmy D'Anello <emmy.danello@animath.fr>

draw/consumers.py

@@ -541,7 +541,7 @@ class DrawConsumer(AsyncJsonWebsocketConsumer):
             if await TeamDraw.objects.filter(participation_id=td.participation_id,
                                              round__draw__tournament=self.tournament,
                                              round__number=1,
-                                             purposed=problem).aexists():
+                                             accepted=problem).aexists():
                 continue
             # Check that the problem is not already chosen once (or twice for a 5-teams pool)
             if await pool.teamdraw_set.filter(accepted=problem).acount() < (2 if pool.size == 5 else 1):