[vte] sixel: Remove obsolete comment

[Christian Persch <chpe src gnome org>]

commit c834c8690d3ecd338b91334702da4c8682634e0d
Author: Christian Persch <chpe src gnome org>
Date:   Sat Apr 3 16:07:50 2021 +0200

    sixel: Remove obsolete comment

 src/sixel-context.cc | 2 --
 1 file changed, 2 deletions(-)
---
diff --git a/src/sixel-context.cc b/src/sixel-context.cc
index aa5c9aee..b24a5b3a 100644
--- a/src/sixel-context.cc
+++ b/src/sixel-context.cc
@@ -374,8 +374,6 @@ Context::image_data(size_t* size,
         /* There may be one scanline at the bottom that extends below the image's height,
          * and needs to be handled specially. First convert all the full scanlines, then
          * the last partial one.
-         *
-         * FIXMEchpe: colour data needs byteswapping for big endian?
          */
         auto scanlines_offsets_pos = scanlines_offsets_begin();
         auto wdata_pos = wdata.get();