Added mapping for the RX Gamepad, e.g. Pandora Box 7

Fixes https://github.com/libsdl-org/SDL/issues/8217

src/joystick/SDL_gamepad_db.h

@@ -252,6 +252,7 @@ static const char *s_GamepadMappings[] = {
     "03000000050b00001c1a000000000000,ROG Chakram X,a:b1,b:b0,leftx:a0,lefty:a1,x:b2,y:b3,",
     "03000000050b0000e318000000000000,ROG Chakram,a:b1,b:b0,leftx:a0,lefty:a1,x:b2,y:b3,",
     "03000000050b0000e518000000000000,ROG Chakram,a:b1,b:b0,leftx:a0,lefty:a1,x:b2,y:b3,",
+    "030000000d0f0000ad00000000000000,RX Gamepad,a:b0,b:b4,back:b11,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,leftshoulder:b3,rightshoulder:b6,start:b9,x:b2,y:b1,",
     "03000000321500000003000000000000,Razer Hydra,a:b0,b:b1,back:b6,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,leftshoulder:b4,leftstick:b8,leftx:a0,lefty:a1,rightshoulder:b5,rightstick:b9,righttrigger:a2,rightx:a3,righty:a4,start:b7,x:b2,y:b3,",
     "03000000321500000204000000000000,Razer Panthera (PS3),a:b1,b:b2,back:b8,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,guide:b12,leftshoulder:b4,leftstick:b10,lefttrigger:b6,leftx:a0,lefty:a1,rightshoulder:b5,rightstick:b11,righttrigger:b7,rightx:a2,righty:a3,start:b9,x:b0,y:b3,",
     "03000000321500000104000000000000,Razer Panthera (PS4),a:b1,b:b2,back:b8,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,guide:b12,leftshoulder:b4,leftstick:b10,lefttrigger:a3,leftx:a0,lefty:a1,rightshoulder:b5,rightstick:b11,righttrigger:a4,rightx:a2,righty:a5,start:b9,x:b0,y:b3,",