Revert "vaapi_h265: Reduce the amount of padding in the stream"

This reverts commit a14a12ca13.

The CTU size is always 32x32; the surface size is what actually sets
the desired property, and it is already correct.

libavcodec/vaapi_encode_h265.c

@@ -815,11 +815,8 @@ static av_cold int vaapi_encode_h265_configure(AVCodecContext *avctx)
     if (err < 0)
         return err;
 
-    // This is an Intel driver constraint.  Despite MinCbSizeY being 8,
-    // we are still required to encode at 16-pixel alignment and then
-    // crop back (so 1080 lines is still encoded as 1088 + cropping).
-    priv->ctu_width     = FFALIGN(ctx->surface_width,  16) / 16;
-    priv->ctu_height    = FFALIGN(ctx->surface_height, 16) / 16;
+    priv->ctu_width     = FFALIGN(ctx->surface_width,  32) / 32;
+    priv->ctu_height    = FFALIGN(ctx->surface_height, 32) / 32;
 
     av_log(avctx, AV_LOG_VERBOSE, "Input %ux%u -> Surface %ux%u -> CTU %ux%u.\n",
            avctx->width, avctx->height, ctx->surface_width,