sceGuScissor has incorrect declaration/implementation

[isage]

Initially reported by 4684321bhjgkjh on discord.

sceGuScissor is declared as

void sceGuScissor(int x, int y, int w, int h);

Which is the same as sce declaration.
However it's implementation sets coordinates as x, y, w-1, h-1, while GE scissor command expects x1, y1, x2, y2 (e.g. coordinates, not width/height)
sce implementation uses x, y, x + w -1, y + h - 1, so it's declaration is correct.

Fixing declaration will make it incompatible with sce sdk.
Fixing implementation will break everything, that expects w and h to actually be x2,y2. This is only the case if (x != 0 && y != 0)
Quick research points that:

1. SDL2/SDL3 expects width/height (so it's most likely broken currently) https://github.com/libsdl-org/SDL/blob/main/src/render/psp/SDL_render_psp.c#L1084-L1094
2. Daedalus expects x2, y2 (so it'll break if implementation is fixed) https://github.com/hulkholden/daedalus/blob/master/Source/HLEGraphics/BaseRenderer.cpp#L1973-L1975
3. Intrafont seems to expect x2, y2 too

[wally4000]

We can fix Daedalus (Wrong repo mentioned though :) ) if this is updated same as Intrafont! :)