changing testerSignInManager tag

Author: Manny Jimenez

firebase-appdistribution/src/main/java/com/google/firebase/appdistribution/TesterSignInManager.java

@@ -44,7 +44,7 @@
 
 /** Class that handles signing in the tester */
 class TesterSignInManager {
-  private static final String TAG = "TesterSignIn:";
+  private static final String TAG = "TesterSignInManager:";
   private static final String SIGNIN_REDIRECT_URL =
       "https://appdistribution.firebase.google.com/pub/testerapps/%s/installations/%s/buildalerts?appName=%s&packageName=%s";