Java to Kotlin converter: better switch conversion in case of code block in case

j2k/tests/testData/ast/switch/caseWithBlock.kt

@@ -0,0 +1,17 @@
+fun foo() {
+    when (a) {
+        1 -> {
+            val x = 1
+            System.out.println(x)
+        }
+
+        2 -> {
+            val x = 2
+            System.out.println(x)
+        }
+
+        3 -> {
+            System.out.println(3)
+        }
+    }
+}