test(language-translator): update test testDocumentTranslation

Author: kevinkowa

language-translator/src/test/java/com/ibm/watson/language_translator/v3/LanguageTranslatorIT.java

@@ -230,7 +230,6 @@ public void testDocumentTranslation() throws FileNotFoundException, InterruptedE
         new TranslateDocumentOptions.Builder()
             .file(new File("src/test/resources/language_translation/document_to_translate.txt"))
             .fileContentType(HttpMediaType.TEXT_PLAIN)
-            .filename("java-integration-test-file")
             .source("en")
             .target("es")
             .build();