Fix adaptation for references with default values after varargs

After vararg argument it's possible to pass values only by name, so
 here we modulate this behavior

 #KT-37721 Fixed

compiler/testData/codegen/box/callableReference/adaptedReferences/referenceToVarargWithDefaults.kt

@@ -0,0 +1,23 @@
+var result = "fail"
+
+fun foo(vararg xs: Int, s1: String = "", s2: String = "OK") {
+    if (xs[0] == 42 && s1 == "good") {
+        result = s2
+    }
+}
+
+fun bar(vararg xs: Int, s: String = "") {}
+
+fun use(fn: (IntArray, String) -> Unit) {
+    fn(intArrayOf(42), "good")
+}
+
+fun test() {
+    use(::foo)
+    use(::bar)
+}
+
+fun box(): String {
+    test()
+    return "OK"
+}