Beetle Saturn - Correct Core's provided FPS

[Immersion95]

It was wrong, the correct infos are :

• 59.83 for NTSC games
• 49.92 for PAL games

It now matches the actual internal FPS on the core.

Source : https://github.com/sonninnos/beetle-saturn-libretro/blob/master/libretro.cpp

if (retro_get_region() == RETRO_REGION_PAL) info->timing.fps = 49.92012779552716; else info->timing.fps = 59.82650314089141;