Fix sed expression in janitor setup.

Signed-off-by: Holger Levsen <holger@layer-acht.org>

bin/janitor_setup_worker.sh

@@ -36,7 +36,7 @@ make -C $TARGET/debian-janitor/breezy realclean all
 make -C $TARGET/debian-janitor/dulwich
 
 cp $TARGET/debian-janitor/sbuildrc $TARGET/sbuildrc
-sed -i "s/\$piuparts_opts = ['--schroot', '%r-%a-sbuild' ];/\$piuparts_opts = ['--schroot', '%r-%a-sbuild', '--no-eatmydata' ];/" $TARGET/sbuildrc
+sed -i "s/\$piuparts_opts = \\['--schroot', '%r-%a-sbuild' \\];/\$piuparts_opts = ['--schroot', '%r-%a-sbuild', '--no-eatmydata' ];/" $TARGET/sbuildrc
 sed -i 's/%r/unstable/' $TARGET/sbuildrc
 
 mkdir -p $TARGET/chroots