games/dino: let the kernel fill the work area

Style bit C was set, which means "do not fill the working area on
window draw". That went unnoticed while the buffer covered the whole
window, but since it ends at the ground line the strip below it was
never painted. Clear the bit, as flpybird does.

programs/games/dino/main.c

@@ -59,7 +59,7 @@ int main(int argc, char* args[]) {
 				win_pos.x, win_pos.y,
 				DEFAULT_WIDTH + 2*WINDOW_BORDER,
 				DEFAULT_HEIGHT + _ksys_get_skin_height() + WINDOW_BORDER,
-				WINDOW_TITLE, BACKGROUND_COLOR, 0x74);
+				WINDOW_TITLE, BACKGROUND_COLOR, 0x34);
 			graphicsRender();
 			_ksys_end_draw();
 			break;