Java to Kotlin converter: supported try-with-resource construct, fixed anonymous class generation + fixed a bug with method return type

#KT-4488 Fixed

j2k/tests/testData/ast/nullability/MethodReturnsNullInAnonymousClass.kt

@@ -4,7 +4,7 @@ trait Getter {
 
 class C() {
     fun foo(b: Boolean): String {
-        val getter = object : Getter() {
+        val getter = object : Getter {
             override fun get(): String? {
                 return null
             }