Move the Wiimote connect code out of Host

I don't know who thought it would be a good idea to put the Wiimote
connect code as part of the Host interface, and have that called
from both the UI code and the core. And then hack around it by having
"force connect" events whenever Host_ConnectWiimote is called
from the core...

Source/Core/DolphinWX/Frame.h

@@ -256,7 +256,6 @@ private:
   void OnStopped();
   void OnRenderWindowSizeRequest(int width, int height);
   void UpdateTitle(const wxString& str);
-  static void ConnectWiimote(int wm_idx, bool connect);
 
   // Event functions
   void PostEvent(wxCommandEvent& event);