Remove unused import

Author: shinfan

google-cloud-speech/src/test/java/com/google/cloud/speech/spi/v1/SpeechClientTest.java

@@ -25,7 +25,6 @@
 import com.google.cloud.speech.v1.LongRunningRecognizeResponse;
 import com.google.cloud.speech.v1.RecognitionAudio;
 import com.google.cloud.speech.v1.RecognitionConfig;
-import com.google.cloud.speech.v1.RecognitionConfig.AudioEncoding;
 import com.google.cloud.speech.v1.RecognizeRequest;
 import com.google.cloud.speech.v1.RecognizeResponse;
 import com.google.cloud.speech.v1.StreamingRecognizeRequest;