update_retroplayer-addons: temporarily add picodrive to exclude list

kodi game repo incorrectly switched from the bundled version to
libretro repo which doesn't work as it uses git submodules.

Exclude it until that's fixed to avoid build breakage by incorrect
bumps.

Signed-off-by: Matthias Reichl <hias@horus.com>

tools/mkpkg/update_retroplayer-addons

@@ -65,6 +65,7 @@ EXCLUDED_PACKAGES="game.libretro.chailove
 	game.libretro.lutro
 	game.libretro.parallel_n64
 	game.libretro.pcem
+	game.libretro.picodrive
 	game.libretro.theodore
 	game.netplay
 	game.shader.presets"