Update Nintendo 64 Controller (sdl2)

[CRefice]

This PR improves the Nintendo Switch N64 Controller autoconfig file by:

• Adding mappings for the Share (Select), ZR (R2), and Home (menu toggle) buttons which were previously missing.
• Mapping both inputs A and Y to button 1 (the A button) so that Retroarch menu navigation works correctly out of the box. This doesn't cause any issues for N64 games at least, but might require some remapping for e.g. SNES games.
• Adding button labels.