Fixed ASS subtitle with anamorphic video.

modules/codec/libass.c

@@ -342,8 +342,6 @@ static void UpdateRegions( video_format_t *p_fmt, spu_t *p_spu,
     fmt.i_height = fmt.i_visible_height;
     fmt.i_bits_per_pixel = 0;
     fmt.i_x_offset = fmt.i_y_offset = 0;
-    fmt.i_sar_num = 1;
-    fmt.i_sar_den = 1;
 
     b_fmt_changed = memcmp( &fmt, &p_ass->fmt, sizeof(fmt) ) != 0;
     if( b_fmt_changed )