add case for #7580

[T4cC0re]

g := gorm.G[T](db)
var _ gorm.ChainInterface[T] = g
var _ gorm.Interface[T] = g

Should not produce a compiler error, but since 1.30.5 it does:

cannot use g (variable of interface type gorm.Interface[T]) as gorm.ChainInterface[T] value in variable declaration: gorm.Interface[T] does not implement gorm.ChainInterface[T] (missing method Count)
cannot use g (variable of interface type gorm.Interface[T]) as gorm.ChainInterface[T] value in struct literal: gorm.Interface[T] does not implement gorm.ChainInterface[T] (missing method Count)

Testing with 1.30.3 the code compiles, as expected.