r600: fix scissor also.

I forgot about r600 being here.

src/mesa/drivers/dri/r600/r700_state.c

@@ -1288,8 +1288,8 @@ void r700SetScissor(context_t *context) //---------------
 	if (context->radeon.state.scissor.enabled) {
 		x1 = context->radeon.state.scissor.rect.x1;
 		y1 = context->radeon.state.scissor.rect.y1;
-		x2 = context->radeon.state.scissor.rect.x2 - 1;
-		y2 = context->radeon.state.scissor.rect.y2 - 1;
+		x2 = context->radeon.state.scissor.rect.x2;
+		y2 = context->radeon.state.scissor.rect.y2;
 	} else {
 		if (context->radeon.radeonScreen->driScreen->dri2.enabled) {
 			x1 = 0;