software/proftpd: use default password "bytes"

no reason to have an exception here.

software/proftpd/buildout.hash.cfg

@@ -19,7 +19,7 @@ md5sum = 39cdfbd3bdfcd48eddb4132ff9dcda62
 
 [instance-default]
 filename = instance-default.cfg.in
-md5sum = 6b8ab50d49136291024c8327aa0931e9
+md5sum = 49167e0b289a87723c3108c4dc4fa8b5
 
 [proftpd-config-file]
 filename = proftpd-config-file.cfg.in

software/proftpd/instance-default.cfg.in

@@ -49,7 +49,6 @@ recipe = slapos.cookbook:userinfo
 [proftpd-password]
 recipe = slapos.cookbook:generate.password
 username = proftpd
-bytes = 12
 
 [proftpd]
 ipv6 = ${instance-parameter:ipv6-random}