Removing unnecessary tag

Author: pranavrajgopal

firebase-app-distribution/src/main/java/com/google/firebase/appdistribution/FirebaseAppDistributionException.java

@@ -20,8 +20,6 @@
 
 /** Possible exceptions thrown in FirebaseAppDistribution */
 public class FirebaseAppDistributionException extends FirebaseException {
- private static final String TAG = "FirebaseAppDistributionException";
-
  public enum Status {
  /** Unknown error. */
  UNKNOWN,