New J2K: add multi-file conversion tests from old j2k

nj2k/testData/multiFile/ProtectedVisibility/InheritorOtherPackage2.kt

@@ -0,0 +1,10 @@
+package test2
+
+import test.BaseOtherPackage
+
+class DerivedOtherPackage protected constructor() : BaseOtherPackage() {
+    init {
+        foo()
+        val i = i
+    }
+}