Remove duplicate entries from keybindings

Remove duplicate entries from keybindings:

patrick@myhostname:~/workspace/mythtv/packaging/deb/debian$ grep CYCLEAUDIOCHAN mythtv_0.27.0.sql | sed 's/)[,;](/)\n(/g' | tail -n +2 | awk ' { a[$0]++} ; END { for (i in a) print a[i] "\t" i } ' | sort | grep ^[^1]
2       ('TV Frontend','CYCLEAUDIOCHAN','Cycle audio channels','','OLDHOSTNAME')
2       ('TV Playback','BACK','Exit or return to DVD menu','','OLDHOSTNAME')
2       ('TV Playback','CYCLEAUDIOCHAN','Cycle audio channels','','OLDHOSTNAME')
2       ('TV Playback','NEXTRAWTEXT','Next Text track','','OLDHOSTNAME')
2       ('TV Playback','PREVRAWTEXT','Previous Text track','','OLDHOSTNAME')
2       ('TV Playback','SELECTRAWTEXT_0','Display Text Subtitle 1','','OLDHOSTNAME')
2       ('TV Playback','TOGGLERAWTEXT','Toggle Text Subtitles','','OLDHOSTNAME')
2       ('TV Playback','TOGGLETEXT','Toggle External Subtitles','','OLDHOSTNAME')