[KSP2] Static fields in base class appear in derived classes

[kuanyingchou]

With Java classes like this:

class JavaBase {
    static String staticField;
}
class JavaDerived extends JavaBase {
}

Calling getDeclaredProperties() on JavaDerived returns staticField as well.

Tested with 2.0.0-Beta3-1.0.18-20240219.110134-28 and a0cd777.