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use screen channel instead of hardcoded values

gives a consistent 2-3 more fps over drawterm

--- a/libnpe_sdl2/sdl2.c

+++ b/libnpe_sdl2/sdl2.c

@@ -341,7 +341,7 @@

 		werrstr("SDL_CreateRGBSurface: memory");

 		return nil;

 	}

-	s->i = i = allocmemimage(Rect(0,0,w,h), ARGB32);

+	s->i = i = allocmemimage(Rect(0,0,w,h), screen->chan);

 	s->format = calloc(1, sizeof(SDL_PixelFormat));

 	switch(bpp){

 	case 32:

@@ -712,6 +712,7 @@

 {

 	Rectangle sr, dr;

 	int logiw, logih;

+	ulong chan;

 	if(rend->logiw > 0 && rend->logih > 0){

 		logiw = rend->logiw;

@@ -735,7 +736,11 @@

 	if(back == nil || Dx(back->r) != logiw || Dy(back->r) != logih){

 		freememimage(back);

-		back = allocmemimage(Rect(0, 0, logiw, logih), ARGB32);

+		if(screen)

+			chan = screen->chan;

+		else

+			chan = ARGB32;

+		back = allocmemimage(Rect(0, 0, logiw, logih), chan);

 		if(back == nil){

 			werrstr("SDL_RenderCopy: %r");

 			return -1;