Remove excess spaces from rc.d scripts

The space between words is already being echoed by the space between quoted strings:

% echo 'foo' 'bar'
foo bar

% echo 'foo' ' baz'
foo  baz

Found in ipfw and mountlate messages.

PR: 247948
Submitted by: Jose Luis Duran <jlduran@gmail.com>
MFC after: 2 weeks
Sponsored by: Klara Inc.