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Fixup SDL_RunApp() for PS2/PSP
This fixes a couple issues I saw in the recent SDL_main/SDL_RunApp() changes in #6750.
Use the mainFunction argument instead of hard-coding SDL_main in SDL_RunApp() for PS2 and PSP. Use SDL_SetMainReady() for PS2, like all other SDL_RunApp(). I'm not knowledgeable about PS2/PSP but these are general changes.
Update SDL_main_impl.h include guard to match the filename.