Really run 'rspamc learn_ham', remove rm(1) call to undefined variable

[robert-scheck]

• It's actually ham learning, not spam learning
• rspamc learn_hpam fails due to bad substitution from spam to ham
• rm -f "${SPAMLIST}" doesn't make sense, because ${SPAMLIST} is undefined

[crpb]

Yeah, i just wrote it down and haven't used/tried anywhere. Thank you!