ControllerInterface: replace Reinitialize with RefreshDevices

The SDL backend crashes when you close a joystick after SDL_Quit has
been called. Some backends don't need to be shutdown and
re-initialized everytime, we can just ask to enumerate devices again.

Source/Core/InputCommon/ControllerInterface/Pipes/Pipes.h

@@ -22,7 +22,7 @@ namespace Pipes
 // SET {L, R} [0, 1]
 // SET {MAIN, C} [0, 1] [0, 1]
 
-void Init();
+void PopulateDevices();
 
 class PipeDevice : public Core::Device
 {