Improve sceKernelStartModule handling

Fixes 'bogus priority' errors (and maybe more).
Tested on God Eater Burst and fixed its "bogus priority". I haven't found any games this breaks.
Update sceKernelModule.cpp
Update sceKernelModule.cpp
Update sceKernelModule.cpp
Merge pull request #1894 from CPkmn/kernel

Improve sceKernelStartModule handling