IR, JS: remove duplicate FQ name check from hasEqualFqName

`hasEqualFqName` is called from `hasAnnotation`, which takes more than
1% of total backend time, so it's important to avoid doing extra work
here.

It seems to be a quirk of the JS IR backend specifically that
`JsExport.Ignore` has incorrect IR parent structure here; for all other
backends, checking FQ name by traversing IR parents should work fine.

 #KT-66281

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/AdditionalIrUtils.kt

@@ -140,7 +140,7 @@ val IrClass.packageFqName: FqName?
     get() = symbol.signature?.packageFqName() ?: parent.getPackageFragment()?.packageFqName
 
 fun IrDeclarationWithName.hasEqualFqName(fqName: FqName): Boolean =
-    symbol.hasEqualFqName(fqName) || name == fqName.shortName() && when (val parent = parent) {
+    name == fqName.shortName() && when (val parent = parent) {
         is IrPackageFragment -> parent.packageFqName == fqName.parent()
         is IrDeclarationWithName -> parent.hasEqualFqName(fqName.parent())
         else -> false