Java to Kotlin converter: fixed some bugs in switch statement conversion

j2k/tests/testData/ast/switch/fallDownWithBlocks.java

@@ -0,0 +1,16 @@
+//file
+public class C {
+    public static void main(String[] args) {
+        switch (args.length) {
+            case 1: {
+                int a = 1;
+                System.out.print("1");
+            }
+
+            case 2: {
+                int a = 2;
+                System.out.print("2");
+            }
+        }
+    }
+}