Don't copy default value parameters for fake overrides

compiler/testData/codegen/box/ir/kt40083.kt

@@ -0,0 +1,21 @@
+// MODULE: lib
+// FILE: lib.kt
+
+// KT-40083
+
+open class X {
+    open fun red(x: Int, y: (() -> Int) = { 31 }): Int {
+        return x+y()
+    }
+}
+
+class Y: X()
+
+// MODULE: main(lib)
+// FILE: main.kt
+fun box(): String {
+    if (Y().red(17) { 23 } != 40) return "FAIL 1"
+    if (Y().red(29) != 60) return "FAIL 2"
+    return "OK"
+}
+