j2k: flatten test cases and testData directory structure

Move j2k/test/tests -> j2k/tests, j2k/test/testData -> j2k/testData

j2k/testData/fileOrElement/superExpression/classAextendsB.kt

@@ -0,0 +1,12 @@
+open class B(i: Int) {
+    open fun call(): Int {
+        return 1
+    }
+}
+
+class A : B(10) {
+
+    override fun call(): Int {
+        return super.call()
+    }
+}