Remove offensive part of error message

Remove offensive part of error message

I don't know the exact cause for someone to submit a bug report for
this error message: if someone is truly offended by it (if so it is
a reminder that some people are more sensitive than others, and I do
want those people to feel welcome as well), or if it's a system's
check (if this goes through, it shows the system works, and the person
might put more work into his/her next patch), or if it's just a bug
(after all, it's not that weird to run two instances of PulseAudio?).
Either one could be reason enough to apply IMO.

Signed-off-by: David Henningsson <david.henningsson@canonical.com>