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

js/js.translator/testData/box/incremental/nestedClassesInDependency.kt

@@ -1,4 +1,3 @@
-// IGNORE_FIR
 // NO_COMMON_FILES
 // MODULE: lib
 // FILE: lib.kt
@@ -13,4 +12,4 @@ class A {
 // FILE: main.kt
 // RECOMPILE
 
-fun box() = A().foo(A.B("OK"))
+fun box() = A().foo(A.B("OK"))