Replace 'if' with 'when': don't remove branch brances

#KT-32650 Fixed

idea/testData/inspectionsLocal/cascadeIf/insideOtherIf.kt.after

@@ -3,9 +3,15 @@ fun println(s: String) {}
 fun test(x: Double, a: Boolean, b: Boolean) {
     if (x > 0.0) {
         when {
-            a -> println("a")
-            b -> println("b")
-            else -> println("none")
+            a -> {
+                println("a")
+            }
+            b -> {
+                println("b")
+            }
+            else -> {
+                println("none")
+            }
         }
     }
 }

idea/testData/inspectionsLocal/cascadeIf/normal.kt

@@ -2,12 +2,10 @@ fun println(s: String) {}
 
 fun test(a: Boolean, b: Boolean) {
     <caret>if (a) {
+        // comment
+        // comment
         println("a")
     }
-    else if (b) {
-        println("b")
-    }
-    else {
-        println("none")
-    }
+    else if (b) println("b")
+    else println("none")
 }

idea/testData/inspectionsLocal/cascadeIf/normal.kt.after

@@ -2,7 +2,11 @@ fun println(s: String) {}
 
 fun test(a: Boolean, b: Boolean) {
     when {
-        a -> println("a")
+        a -> {
+            // comment
+            // comment
+            println("a")
+        }
         b -> println("b")
         else -> println("none")
     }

idea/testData/inspectionsLocal/cascadeIf/withAnnotation.kt.after

@@ -1,9 +1,15 @@
 // WITH_RUNTIME
 fun foo(a: Any) {
     when (a) {
-        "" -> println(a)
-        is String -> println(a)
-        is List<*> -> @Suppress("UNCHECKED_CAST")
-        println(a as List<String>)
+        "" -> {
+            println(a)
+        }
+        is String -> {
+            println(a)
+        }
+        is List<*> -> {
+            @Suppress("UNCHECKED_CAST")
+            println(a as List<String>)
+        }
     }
 }