Removed unused DBContext for roles

RentACar/Data/RentACarDbContext.cs

@@ -8,7 +8,6 @@ namespace Data
     {      
         public virtual DbSet<User> Users { get; set; }
         public virtual DbSet<Car> Cars { get; set; }
-        public virtual DbSet<Role> Roles { get; set; }
         public virtual DbSet<Rents> Request { get; set; }
 
     }