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

js/js.translator/testData/box/inlineMultiModule/callFunction.kt

@@ -1,4 +1,3 @@
-// IGNORE_FIR
 // EXPECTED_REACHABLE_NODES: 1285
 // MODULE: lib
 // FILE: lib.kt
@@ -39,4 +38,4 @@ fun box(): String {
     if (result != "Baz.call(4)") return "fail4: $result"
 
     return "OK"
-}
+}