Don't delete seek_time

pod

@@ -133,11 +133,9 @@ case "$CMD" in
         if [ $# -lt 1 ] ; then
             FILE=$(get_cur_file)
             git_annex_wrap metadata -s tag=listened $FILE
-            git_annex_wrap metadata -r seek_time $FILE
         else
             for FILE in $* ; do
                 git_annex_wrap metadata -s tag=listened $FILE
-                git_annex_wrap metadata -r seek_time $FILE
             done
         fi
         exit