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.cpp

@@ -41,7 +41,7 @@ static double StringToDouble(const std::string& text)
   return result;
 }
 
-void Init()
+void PopulateDevices()
 {
   // Search the Pipes directory for files that we can open in read-only,
   // non-blocking mode. The device name is the virtual name of the file.

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
 {