Set OP to msg.what instead of msg.arg1

Bug: 161207764
Test: manual
Change-Id: I6fc37039c2153211c5bc669aca4a2e642dfd935a
diff --git a/src/com/android/stk/StkAppService.java b/src/com/android/stk/StkAppService.java
index 5029e72..4ef5f6c 100644
--- a/src/com/android/stk/StkAppService.java
+++ b/src/com/android/stk/StkAppService.java
@@ -834,8 +834,7 @@
                 // "home" so we accept both here
                 if (SYSTEM_DIALOG_REASON_HOME_KEY.equals(reason)
                     || SYSTEM_DIALOG_REASON_RECENTAPPS_KEY.equals(reason)) {
-                    Message message = mServiceHandler.obtainMessage();
-                    message.arg1 = OP_HOME_KEY_PRESSED;
+                    Message message = mServiceHandler.obtainMessage(OP_HOME_KEY_PRESSED);
                     mServiceHandler.sendMessage(message);
                 }
             }