Fix private setter visibility for generic class

#KT-8888 fixed

compiler/testData/diagnostics/tests/scopes/invisibleSetter.txt

@@ -0,0 +1,11 @@
+package
+
+public fun main(/*0*/ args: kotlin.Array<kotlin.String>): kotlin.Unit
+
+public final class A</*0*/ T> {
+    public constructor A</*0*/ T>()
+    public final var x: kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}