[KSP2] Property setter parameter name becomes `value`

In KSP2 the parameter name of property setters is `value` when the origin is `KOTLIN_LIB` but is `<set-?>` when the origin is `KOTLIN`, while it was always `<set-?>` in KSP1.

Repro: https://github.com/kuanyingchou/ksp/commit/49600e0fd5933bee4338eaee9b7b7dfe86636fa8