FIR2IR: Do not add fake override if the member is overridden

#KT-56398 Fixed

compiler/testData/codegen/box/multiplatform/multiModule/expectInterfaceInheritance.kt

@@ -0,0 +1,25 @@
+// ISSUE: KT-56398
+// TARGET_BACKEND: JVM
+// !LANGUAGE: +MultiPlatformProjects
+
+// MODULE: common
+// TARGET_PLATFORM: Common
+// FILE: common.kt
+
+expect interface Interface {
+    fun foo(): String
+}
+
+class Klass : Interface {
+    override fun foo() = "OK"
+}
+
+// MODULE: jvm()()(common)
+// TARGET_PLATFORM: JVM
+// FILE: main.kt
+
+actual interface Interface {
+    actual fun foo(): String
+}
+
+fun box() = Klass().foo()