Decode URI in RequestManageCredentials

* URI should be human readable and not
  in percent-encoded form

Manual Testing steps
* Install TestDPC
* Select preference Request to manage credentials
* Verify activity displays URIs in a human
  readable format

Bug: 177900145
Test: Manual testing
Change-Id: I7b5f92f4939491a40bc3728aab56e06886fc08f1

src/com/android/settings/security/UriAuthenticationPolicyAdapter.java

@@ -74,7 +74,7 @@ public class UriAuthenticationPolicyAdapter extends
     public void onBindViewHolder(UriAuthenticationPolicyAdapter.UriViewHolder holder,
             int position) {
         Uri uri = mUris.get(position);
-        holder.mUriNameView.setText(uri.toString());
+        holder.mUriNameView.setText(Uri.decode(uri.toString()));
     }
 
     @Override