[PT15] Tiny bugfix in setGlobalProxy

This bug has existed for a long time. If mDefaultProxyEnabled is
false, then the mDefaultProxy member should obviously not be used
in the broadcast.

Test: runtest
Change-Id: I599a2ff9f96d4667e824cf000c2125f86010bb02

services/core/java/com/android/server/connectivity/ProxyTracker.java

@@ -269,7 +269,7 @@ public class ProxyTracker {
                 Binder.restoreCallingIdentity(token);
             }
 
-            sendProxyBroadcast(mGlobalProxy == null ? mDefaultProxy : proxyInfo);
+            sendProxyBroadcast(getDefaultProxy());
         }
     }