Fix GameController interface on Switch (#54)

Author: rsn8887

src/joystick/SDL_gamecontrollerdb.h

@@ -993,7 +993,7 @@ static const char *s_ControllerMappings[] = {
     "000000004e696e74656e646f20334400,Nintendo 3DS,crc:3210,a:b0,b:b1,back:b2,dpdown:b7,dpleft:b5,dpright:b4,dpup:b6,leftshoulder:b9,lefttrigger:b14,leftx:a0,lefty:a1,rightshoulder:b8,righttrigger:b15,rightx:a2,righty:a3,start:b3,x:b10,y:b11,",
 #endif
 #if defined(SDL_JOYSTICK_SWITCH)
-    "53776974636820436F6E74726F6C6C65,Switch Controller,a:b1,b:b0,back:b11,dpdown:b15,dpleft:b12,dpright:b14,dpup:b13,leftshoulder:b6,leftstick:b4,lefttrigger:b8,leftx:a0,lefty:a1,rightshoulder:b7,rightstick:b5,righttrigger:b9,rightx:a2,righty:a3,start:b10,x:b3,y:b2,",
+    "000038f853776974636820436f6e7400,Switch Controller,a:b1,b:b0,back:b11,dpdown:b15,dpleft:b12,dpright:b14,dpup:b13,leftshoulder:b6,leftstick:b4,lefttrigger:b8,leftx:a0,lefty:a1,rightshoulder:b7,rightstick:b5,righttrigger:b9,rightx:a2,righty:a3,start:b10,x:b3,y:b2,",
 #endif
     "hidapi,*,a:b0,b:b1,back:b4,dpdown:b12,dpleft:b13,dpright:b14,dpup:b11,guide:b5,leftshoulder:b9,leftstick:b7,lefttrigger:a4,leftx:a0,lefty:a1,rightshoulder:b10,rightstick:b8,righttrigger:a5,rightx:a2,righty:a3,start:b6,x:b2,y:b3,",
     NULL

src/joystick/switch/SDL_sysjoystick.c

@@ -201,12 +201,9 @@ static void SWITCH_JoystickSetDevicePlayerIndex(int device_index, int player_ind
 }
 
 static SDL_JoystickGUID SWITCH_JoystickGetDeviceGUID(int device_index) {
-    SDL_JoystickGUID guid;
-    /* the GUID is just the first 16 chars of the name for now */
+    /* the GUID is just the name for now */
     const char *name = SWITCH_JoystickGetDeviceName(device_index);
-    SDL_zero(guid);
-    SDL_memcpy(&guid, name, SDL_min(sizeof(guid), SDL_strlen(name)));
-    return guid;
+    return SDL_CreateJoystickGUIDForName(name);
 }
 
 /* Function to perform the mapping from device index to the instance id for this index */