Do not add a new label to labeled loop

Relevant situation: break / continue in when #KT-16128 Fixed

idea/testData/quickfix/when/continueInWhenInLabeled.kt

@@ -0,0 +1,14 @@
+// "Add '@loop' to continue" "true"
+// WITH_RUNTIME
+
+fun foo(chars: CharArray) {
+    val length = chars.size
+    var pos = 0
+    loop@ while (pos < length) {
+        val c = chars[pos]
+        when (c) {
+            '\n' -> continue<caret>
+        }
+        pos++
+    }
+}