[JS IR] Not nullize external varargs if it is not on the end of call

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/jsAstUtils.kt

@@ -316,7 +316,7 @@ fun translateCallArguments(
                     result is JsArrayLiteral &&
                     result.expressions.isEmpty()
 
-            if (isEmptyExternalVararg) {
+            if (isEmptyExternalVararg && index == size - 1) {
                 null
             } else result
         }