FIR: Fix overrides binding for Java inheritor

`overriddenMembers` contract requires original (non-enhanced) function
See other usages

Ignored tests have been working accidentally

^KT-43289 Open

compiler/fir/analysis-tests/testData/resolve/defaultParametersInheritedToJava.kt

@@ -0,0 +1,15 @@
+// FILE: main.kt
+
+fun foo(j: MyJavaClass) {
+    j.bar()
+}
+
+abstract class MyClass {
+    open fun bar(y: String? = null) {}
+}
+
+// FILE: MyJavaClass.java
+
+public class MyJavaClass extends MyClass {
+    public void bar(String y) {}
+}

compiler/fir/analysis-tests/testData/resolve/defaultParametersInheritedToJava.txt

@@ -0,0 +1,13 @@
+FILE: main.kt
+    public final fun foo(j: R|MyJavaClass|): R|kotlin/Unit| {
+        R|<local>/j|.R|/MyJavaClass.bar|()
+    }
+    public abstract class MyClass : R|kotlin/Any| {
+        public constructor(): R|MyClass| {
+            super<R|kotlin/Any|>()
+        }
+
+        public open fun bar(y: R|kotlin/String?| = Null(null)): R|kotlin/Unit| {
+        }
+
+    }