Let the buttons in the config joypad

==Game Boy systems==
===Game Boy/Game Boy Color===
*A Key = A Button
*B Key = B Button
*↑ Key = Up
*↓ Key = Down
*← Key = Left
*→ Key = Right
*Enter Key = Start
*Right Shift Key = Select
*C Key = GS
*F12 Key = Capture
===Game Boy Advance===
*A Key = A Button
*B Key = B Button
*L Key = L Button
*R Key = R Button
*↑ Key = Up
*↓ Key = Down
*← Key = Left
*→ Key = Right
*Enter Key = Start
*Right Shift Key = Select
*C Key = GS
*F12 Key = Capture