JS IR: unmute tests

compiler/testData/codegen/box/dataClasses/hashCode/char.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 data class A(val a: Char)
 
 fun box() : String {

compiler/testData/codegen/box/dataClasses/privateValParams.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JS_IR
 data class D(private val x: Long, private val y: Char) {
     fun foo() = "${component1()}${component2()}"
 }