Remove the conversion from premultiplied alpha, ...

...as I found a case where it makes the output almost unreadable, and
cannot find another test case where it makes it better, which I'm
pretty sure I had when I did this.
Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

modules/codec/kate.c

@@ -824,6 +824,7 @@ static void SubpictureReleaseRegions( subpicture_t *p_subpic )
     }
 }
 
+#if 0
 /*
  * We get premultiplied alpha, but VLC doesn't expect this, so we demultiply
  * alpha to avoid double multiply (and thus thinner text than we should)).
@@ -874,6 +875,7 @@ static void PostprocessTigerImage( plane_t *p_plane, unsigned int i_width )
     }
     PROFILE_STOP( tiger_renderer_postprocess );
 }
+#endif
 
 /* Tiger renders can end up looking a bit crap since they get overlaid on top of
    a subsampled YUV image, so there can be a fair amount of chroma bleeding.
@@ -975,7 +977,9 @@ static void TigerUpdateRegions( spu_t *p_spu, subpicture_t *p_subpic, const vide
     }
     PROFILE_STOP( tiger_renderer_render );
 
+#if 0
     PostprocessTigerImage( p_plane, fmt.i_width );
+#endif
     p_subpic->p_region = p_r;
     p_sys->b_dirty = false;