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/newClassExpression/genericClassInvocation.kt

@@ -1,7 +1,7 @@
 import java.util.LinkedList
 
-open class User() {
-    open fun main() {
-        var list: MutableList<String?>? = LinkedList<String?>()
+class User() {
+    fun main() {
+        val list = LinkedList<String>()
     }
 }