Don't force the default group

bukkit/src/main/java/me/lucko/luckperms/users/BukkitUserManager.java

@@ -70,7 +70,6 @@ public class BukkitUserManager extends UserManager implements ContextListener<Pl
         BukkitUser user = id.getUsername() == null ?
                 new BukkitUser(id.getUuid(), plugin) :
                 new BukkitUser(id.getUuid(), id.getUsername(), plugin);
-        giveDefaultIfNeeded(user, false);
         return user;
     }
 

bungee/src/main/java/me/lucko/luckperms/users/BungeeUserManager.java

@@ -49,7 +49,6 @@ public class BungeeUserManager extends UserManager implements ContextListener<Pr
         BungeeUser user = id.getUsername() == null ?
                 new BungeeUser(id.getUuid(), plugin) :
                 new BungeeUser(id.getUuid(), id.getUsername(), plugin);
-        giveDefaultIfNeeded(user, false);
         return user;
     }
 

sponge/src/main/java/me/lucko/luckperms/users/SpongeUserManager.java

@@ -53,7 +53,6 @@ public class SpongeUserManager extends UserManager implements ContextListener<Pl
         SpongeUser user = id.getUsername() == null ?
                 new SpongeUser(id.getUuid(), plugin) :
                 new SpongeUser(id.getUuid(), id.getUsername(), plugin);
-        giveDefaultIfNeeded(user, false);
         return user;
     }