Use proper flag for interface method invocation

compiler/testData/codegen/java8/box/jvm8/interfaceFlag/superCall.kt

@@ -0,0 +1,24 @@
+// FILE: Simple.java
+
+public interface Simple {
+    default String test() {
+        return "O";
+    }
+
+    static String testStatic() {
+        return "K";
+    }
+}
+
+// FILE: main.kt
+// JVM_TARGET: 1.8
+class TestClass : Simple {
+    override fun test(): String {
+        return super.test()
+    }
+}
+
+
+fun box(): String {
+    return TestClass().test() + Simple.testStatic()
+}