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

js/js.translator/testData/box/multiModuleWrappers/umd/moduleWithNonIdentifierName.kt

@@ -1,4 +1,3 @@
-// IGNORE_FIR
 // EXPECTED_REACHABLE_NODES: 1286
 // MODULE: module_1
 // MODULE_KIND: UMD
@@ -11,4 +10,4 @@ fun bar() = "bar"
 fun box(): String {
     assertEquals("bar", bar())
     return "OK"
-}
+}

js/js.translator/testData/box/multiModuleWrappers/umd/simple.kt

@@ -1,4 +1,3 @@
-// IGNORE_FIR
 // EXPECTED_REACHABLE_NODES: 1286
 // MODULE: module1
 // MODULE_KIND: UMD
@@ -11,4 +10,4 @@ fun bar() = "bar"
 fun box(): String {
     assertEquals("bar", bar())
     return "OK"
-}
+}