If to when: do not add label to outer loop if not necessary

So #KT-24767 Fixed

idea/testData/intentions/branched/ifWhen/ifToWhen/withLoopNoJumps.kt

@@ -0,0 +1,5 @@
+fun test() {
+    for (i in -2..2) {
+        <caret>if (i > 0) i.hashCode()
+    }
+}

idea/testData/intentions/branched/ifWhen/ifToWhen/withLoopNoJumps.kt.after

@@ -0,0 +1,7 @@
+fun test() {
+    for (i in -2..2) {
+        when {
+            i > 0 -> i.hashCode()
+        }
+    }
+}