[JS] Remove non-functional IGNORE_FIR directive in js box tests

js/js.translator/testData/box/export/defaultInlineClassConstructorParam.kt

@@ -1,4 +1,3 @@
-// IGNORE_FIR
 // KT-49225
 // RUN_PLAIN_BOX_FUNCTION
 // IGNORE_BACKEND: JS
@@ -15,4 +14,4 @@ class Bar(val koo: Koo = Koo())
 // FILE: main.js
 function box() {
     return new kotlin_lib.Bar().koo;
-}
+}