fixed is_team_member rule

rowers/rower_rules.py

@@ -259,9 +259,9 @@ def is_rower_team_member(user,rower):
 
     for team in teams:
         if team.private == 'open':
-            if team in rower.team.all():
+            if team in user.rower.team.all():
                 return True
-        if team.manager == rower.user:
+        if team.manager == user:
             return True
 
     return False