Make Proxy change broadcast sticky

Makes it easier for apps who care.  Includes the current values.

Change-Id: I5f1d3589a036ebc9910281f97d4780ecda2829f2
diff --git a/services/java/com/android/server/ConnectivityService.java b/services/java/com/android/server/ConnectivityService.java
index 43c857a..f1fce3e 100644
--- a/services/java/com/android/server/ConnectivityService.java
+++ b/services/java/com/android/server/ConnectivityService.java
@@ -2163,7 +2163,7 @@
         Intent intent = new Intent(Proxy.PROXY_CHANGE_ACTION);
         intent.addFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING);
         intent.putExtra(Proxy.EXTRA_PROXY_INFO, proxy);
-        mContext.sendBroadcast(intent);
+        mContext.sendStickyBroadcast(intent);
     }
 
     private static class SettingsObserver extends ContentObserver {