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

js/js.translator/testData/box/multiModule/clashedDeclLinkage.kt

@@ -1,4 +1,3 @@
-// IGNORE_FIR
 // EXPECTED_REACHABLE_NODES: 1283
 // KJS_WITH_FULL_RUNTIME
 
@@ -40,4 +39,4 @@ import bar.*
 
 fun box(): String {
     return o() + k()
-}
+}