[K2 JS] Unmute and link to issue some JS K2 tests

compiler/testData/codegen/box/when/enumOptimization/kt14802.kt

@@ -1,8 +1,5 @@
-// IGNORE_BACKEND_K2: JS_IR, JS_IR_ES6
 // CHECK_CASES_COUNT: function=crash count=2 TARGET_BACKENDS=JS
-// CHECK_CASES_COUNT: function=crash count=0 IGNORED_BACKENDS=JS
 // CHECK_IF_COUNT: function=crash count=1 TARGET_BACKENDS=JS
-// CHECK_IF_COUNT: function=crash count=3 IGNORED_BACKENDS=JS
 
 class EncapsulatedEnum<T : Enum<T>>(val value: T)
 
@@ -28,4 +25,4 @@ var res = "fail"
 fun box(): String {
     crash(EncapsulatedEnum(MyEnum.VALUE_A))
     return res
-}
+}