Java to Kotlin converter: no more 2 conversion modes for each test, just a few tests to test non-standard settings

j2k/tests/testData/ast/class/privateInit.kt

@@ -1,4 +1,4 @@
-public open class MyClass() {
+public class MyClass() {
     private fun init(arg1: Int, arg2: Int, arg3: Int) {
     }
 }