HLE/APT: Always return an error from PrepareToStartNewestHomeMenu so that the Home Menu doesn't try to reboot the system.

As per 3dbrew:
"During Home Menu start-up it uses APT:PrepareToStartNewestHomeMenu. If that doesn't return an error(normally NS returns 0xC8A0CFFC for that), Home Menu starts a hardware reboot with APT:StartNewestHomeMenu etc. "

src/core/hle/service/apt/apt.h

@@ -419,6 +419,16 @@ void GetAppCpuTimeLimit(Service::Interface* self);
  */
 void PrepareToStartLibraryApplet(Service::Interface* self);
 
+/**
+ * APT::PrepareToStartNewestHomeMenu service function
+ *  Inputs:
+ *      0 : Command header [0x001A0000]
+ *  Outputs:
+ *      0 : Return header
+ *      1 : Result of function
+ */
+void PrepareToStartNewestHomeMenu(Service::Interface* self);
+
 /**
  * APT::PreloadLibraryApplet service function
  *  Inputs: