typo: LB_APT_HTT(P)_PROXY

[Philipp Kempgen <lists@kempgen.net>]

Hey folks,

Lazy bug report:

functions/defaults.sh line 60
( http://live.debian.net/gitweb?p=live-build.git;a=blob;f=functions/defaults.sh;h=a5b9bdf0c387b4e5c9b50e58419c269b0febc519;hb=HEAD#l60 )
s/LB_APT_HTT_PROXY/LB_APT_HTTP_PROXY/

Cheers,
  Philipp