[tracker] writeback: support saving metadata for GIFs

[Giovanni Campagna <gcampagna src gnome org>]

commit 01d8d19f14699eb8b707cc05b4a93a4df8c13a05
Author: Giovanni Campagna <gcampagna src gnome org>
Date:   Sat Jan 18 14:30:38 2014 +0100

    writeback: support saving metadata for GIFs
    
    GIFs support XMP metadata just fine, there is no reason not to
    implement it.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=733316

 src/tracker-writeback/tracker-writeback-xmp.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/tracker-writeback/tracker-writeback-xmp.c b/src/tracker-writeback/tracker-writeback-xmp.c
index 73b0df0..6b614e1 100644
--- a/src/tracker-writeback/tracker-writeback-xmp.c
+++ b/src/tracker-writeback/tracker-writeback-xmp.c
@@ -92,11 +92,11 @@ writeback_xmp_content_types (TrackerWritebackFile *wbf)
                "image/tiff",  /* .tiff & .tif files */
                "video/mp4",   /* .mp4 files */
                "video/3gpp",  /* .3gpp files */
+                "image/gif",   /* .gif files */
                NULL
        };
 
-       /* "image/gif"                        .gif files
-          "application/pdf"                  .pdf files
+       /* "application/pdf"                  .pdf files
           "application/rdf+xml"              .xmp files
           "application/postscript"           .ps files
           "application/x-shockwave-flash"    .swf files