Fix caching of light class data for nested classes

idea/testData/findUsages/java/findJavaClassUsages/JKInterfaceDerivedInnerClasses.1.kt

@@ -0,0 +1,11 @@
+class Outer {
+    public open class X: A
+
+    public trait T: A
+
+    class Inner {
+        public open class Y: X()
+
+        public class Z: Y(), T
+    }
+}