JS: fix translation of augmented assignment when RHS changes value of LHS

compiler/testData/codegen/box/coroutines/controlFlow/switchLikeWhen.kt

@@ -1,9 +1,6 @@
 // WITH_RUNTIME
 // NO_INTERCEPT_RESUME_TESTS
 
-// TODO: fix bug in JVM backend and remove this directive
-// TARGET_BACKEND: JS
-
 class Controller {
     var result = ""
 
@@ -29,7 +26,7 @@ fun box(): String {
             }
         }
     }
-    if (value != "A;[B][C]!") return "fail: suspend as if condition: $value"
+    if (value != "A;B]C]!") return "fail: suspend as if condition: $value"
 
     return "OK"
 }