Fix exception in ultra-light classes in case of complex mpp hierarchy

Without the introduced override, default implementation of isEquivalentTo
runs delegate computation of `another` that is illegal
for KtUltraLightClass

^KT-28912 Fixed

idea/testData/navigation/implementations/multiModule/actualTypeAliasWithAnonymousSubclass/common/common.kt

@@ -0,0 +1,14 @@
+// ULTRA_LIGHT_CLASSES
+package test
+
+expect interface Closable {
+    fun <caret>close()
+}
+
+expect class MyStream : Closable {}
+
+open class MyImpl : Closable {
+    override fun close() {}
+}
+
+// REF: [testModule_Common] (in test.MyImpl).close()

idea/testData/navigation/implementations/multiModule/actualTypeAliasWithAnonymousSubclass/jvm/jvm.kt

@@ -0,0 +1,9 @@
+package test
+
+actual interface Closable {
+    fun close()
+}
+
+actual typealias MyStream = MyImpl
+
+fun foo(): Any? = object : MyStream() {}