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

js/js.translator/testData/box/inline/faultyRedundantCallElimination.kt

@@ -1,4 +1,3 @@
-// IGNORE_FIR
 // EXPECTED_REACHABLE_NODES: 1311
 
 // MODULE: lib
@@ -26,4 +25,4 @@ val a = A
 
 // CHECK_BREAKS_COUNT: function=box count=0 TARGET_BACKENDS=JS_IR
 // CHECK_LABELS_COUNT: function=box name=$l$block count=0 TARGET_BACKENDS=JS_IR
-fun box() = O() + K(a)
+fun box() = O() + K(a)