Revert "Set stricter permissions on /nix/store"

This reverts commit 066758758e7c0768ff8da51d208cdae0f33b368c because
it breaks NixOS VM tests.

Changed files
+2 -2
nixos
modules
installer
system
+1 -1
nixos/modules/installer/tools/nixos-install.sh
···
$mountPoint/nix/var/nix/db \
$mountPoint/nix/var/log/nix/drvs
-
mkdir -m 1735 -p $mountPoint/nix/store
+
mkdir -m 1775 -p $mountPoint/nix/store
chown root:nixbld $mountPoint/nix/store
+1 -1
nixos/modules/system/boot/stage-2-init.sh
···
# Silence chown/chmod to fail gracefully on a readonly filesystem
# like squashfs.
chown -f 0:30000 /nix/store
-
chmod -f 1735 /nix/store
+
chmod -f 1775 /nix/store
if [ -n "@readOnlyStore@" ]; then
if ! readonly-mountpoint /nix/store; then
mount --bind /nix/store /nix/store