Addressed Bunnei's review comments, and made some other tweaks:

- Deleted GetStatus() because it wasn't used anywhere outside of Core::System.
 - Fixed design flaw where the message bar status could be set despite the game being stopped.

src/core/loader/ncch.h

@@ -179,7 +179,7 @@ public:
 
     /**
      * Loads the Exheader and returns the system mode for this application.
-     * @returns a pair of Optional with the kernel system mode and ResultStatus
+     * @returns A pair with the optional system mode, and and the status.
      */
     std::pair<boost::optional<u32>, ResultStatus> LoadKernelSystemMode() override;