bootstrap_archives: remove unnecessary param default

all uses of this script pass in a suitable 'pass' param, and a previous
commit added a validation check. Having a fallback to 'binary' should a
param not be supplied is completely unnecessary.

fyi, this script is only ever called from the bootstrap stage and with
'binary' as the param, thus supporting being called with 'source' and
indeed having a 'pass' param at all is surely utterly pointless in itself.

Gbp-Dch: Ignore

scripts/build/bootstrap_archives

@@ -18,11 +18,8 @@ DESCRIPTION="$(Echo 'manage /etc/apt/sources.list')"
 HELP=""
 USAGE="${PROGRAM} [source|binary] [--force]"
 
-_PASS="${1:-binary}"
-if [ -n "${1}" ]
-then
-	shift
-fi
+_PASS="${1}"
+shift
 
 if [ "${_PASS}" != "binary" ] && [ "${_PASS}" != "source" ]; then
 	Usage