Added support for the 6-button SEGA Mega Drive Control Pad for Nintendo Online

Closes https://github.com/libsdl-org/SDL/pull/9225

src/joystick/SDL_gamepad.c

@@ -736,7 +736,7 @@ static GamepadMapping_t *SDL_CreateMappingForHIDAPIGamepad(SDL_JoystickGUID guid
             SDL_strlcat(mapping_string, "a:b0,b:b1,back:b4,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,guide:b5,leftshoulder:b9,leftstick:b7,lefttrigger:a4,leftx:a0,lefty:a1,rightshoulder:b10,righttrigger:a5,start:b6,x:b2,y:b3,misc1:b11,", sizeof(mapping_string));
             break;
         case k_eSwitchDeviceInfoControllerType_SEGA_Genesis:
-            SDL_strlcat(mapping_string, "a:b0,b:b1,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,guide:b5,rightshoulder:b10,righttrigger:a5,start:b6,misc1:b11,", sizeof(mapping_string));
+            SDL_strlcat(mapping_string, "a:b0,b:b1,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,guide:b5,leftshoulder:b9,rightshoulder:b10,righttrigger:a5,start:b6,x:b2,y:b3,misc1:b11,", sizeof(mapping_string));
             break;
         case k_eWiiExtensionControllerType_None:
             SDL_strlcat(mapping_string, "a:b0,b:b1,back:b4,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,guide:b5,start:b6,x:b2,y:b3,", sizeof(mapping_string));