fix fehler durch ef update

ReallifeGamemode.Database/Models/DatabaseContext.cs

@@ -37,6 +37,8 @@ namespace ReallifeGamemode.Database.Models
     {
       base.OnModelCreating(modelBuilder);
 
+      modelBuilder.UsePropertyAccessMode(PropertyAccessMode.PreferFieldDuringConstruction);
+
       modelBuilder.Entity<Entities.BusinessBankAccount>()
           .HasIndex(b => b.BusinessId)
           .IsUnique(true);