Fix Heart Rate Service example

Name must be appended at end, not beginning.

Test: run bt-example-hr-server --advertise
Change-Id: I70909e0bfc94521c396908d0dcb78cf4439a7e63

system/service/example/heart_rate/heart_rate_server.cc

@@ -64,7 +64,7 @@ class CLIBluetoothLeAdvertiserCallback
                               0x00};
     data.push_back(name.length() + 1);
     data.push_back(bluetooth::kEIRTypeCompleteLocalName);
-    data.insert(data.begin(), name.c_str(), name.c_str() + name.length());
+    data.insert(data.end(), name.c_str(), name.c_str() + name.length());
 
     base::TimeDelta timeout;