Snippet typo fix.

Change-Id: Ib8407bc379d53e288bd89c697acba08626c80b3b

Author: zhouyiself

android/android-snippets/app/src/main/java/com/google/example/mlkit/FaceDetectionActivity.java

@@ -46,7 +46,7 @@ private void detectFaces(InputImage image) {
         // [START set_detector_options]
         FaceDetectorOptions options =
                 new FaceDetectorOptions.Builder()
-                        .setClassificationMode(FaceDetectorOptions.PERFORMANCE_MODE_ACCURATE)
+                        .setPerformanceMode(FaceDetectorOptions.PERFORMANCE_MODE_ACCURATE)
                         .setLandmarkMode(FaceDetectorOptions.LANDMARK_MODE_ALL)
                         .setClassificationMode(FaceDetectorOptions.CLASSIFICATION_MODE_ALL)
                         .setMinFaceSize(0.15f)

android/android-snippets/app/src/main/java/com/google/example/mlkit/kotlin/FaceDetectionActivity.kt

@@ -25,7 +25,7 @@ class FaceDetectionActivity : AppCompatActivity() {
     private fun detectFaces(image: InputImage) {
         // [START set_detector_options]
         val options = FaceDetectorOptions.Builder()
-                .setClassificationMode(FaceDetectorOptions.PERFORMANCE_MODE_ACCURATE)
+                .setPerformanceMode(FaceDetectorOptions.PERFORMANCE_MODE_ACCURATE)
                 .setLandmarkMode(FaceDetectorOptions.LANDMARK_MODE_ALL)
                 .setClassificationMode(FaceDetectorOptions.CLASSIFICATION_MODE_ALL)
                 .setMinFaceSize(0.15f)