fix pacman config

usr/lib/archboot/installer/pacman.sh

@@ -2,14 +2,17 @@
 # SPDX-License-Identifier: GPL-2.0-only
 # created by Tobias Powalowski <tpowa@archlinux.org>
 _getsource() {
+    if [[ -z ${_S_SRC} ]]; then
         _PACMAN_CONF=""
         if [[ -e "${_LOCAL_DB}" ]]; then
             _local_pacman_conf
         fi
+    fi
     _S_SRC=1
 }
 
 _run_pacman(){
+    _getsource
     _chroot_mount
     _dialog --title " Pacman " --infobox "Installing package(s) to ${_DESTDIR}:\n${_PACKAGES}...\n\nCheck ${_VC} console (ALT-F${_VC_NUM}) for progress..." 8 70
     echo "Installing Packages..." >/tmp/pacman.log