adb: report connection status when we're unauthorized.

Previously, connecting to devices that end up as unauthorized would
wait 10 seconds before reporting failure to the user. After this
change, notification happens as soon as the adb server realizes.

Test: manual
Change-Id: If7c8d38f22da3d98b952eee6a334abc8566bb751
diff --git a/adb/client/auth.cpp b/adb/client/auth.cpp
index 5fbef09..71c19b8 100644
--- a/adb/client/auth.cpp
+++ b/adb/client/auth.cpp
@@ -465,6 +465,7 @@
     if (key == nullptr) {
         // No more private keys to try, send the public key.
         t->SetConnectionState(kCsUnauthorized);
+        t->SetConnectionEstablished(true);
         send_auth_publickey(t);
         return;
     }