Kapt3: Nested class inside an interface should always be public and static (KT-15145)

plugins/kapt3/testData/converter/kt15145.kt

@@ -0,0 +1,4 @@
+interface MyInterface {
+    fun someFun()
+    private class MyDefaultInferface()
+}

plugins/kapt3/testData/converter/kt15145.txt

@@ -0,0 +1,11 @@
+public abstract interface MyInterface {
+
+    public abstract void someFun();
+
+    public static final class MyDefaultInferface {
+
+        public MyDefaultInferface() {
+            super();
+        }
+    }
+}