systemd/systemd: fix typo in pre-install (MR 5468)

The space here caused this install script to attempt to create a group
named '2' and add a user named 'sgx' to it.

[ci:skip-build] already built successfully in CI

extra-repos/systemd/systemd/APKBUILD

@@ -5,7 +5,7 @@
 pkgname=systemd
 pkgver=256
 _pkgver="musl-v${pkgver//_/-}"
-pkgrel=1
+pkgrel=2
 pkgdesc="System and service manager"
 url="https://github.com/systemd/systemd"
 arch="all !ppc64le !armhf !s390x" # blocked by pmboostrap not supporting

extra-repos/systemd/systemd/systemd.pre-install

@@ -7,6 +7,6 @@ adduser -S -H -D -h / -s /usr/sbin/nologin -g 'systemd Core Dumper' systemd-core
 addgroup -S systemd-network 2>/dev/null
 addgroup -S systemd-journal 2>/dev/null
 addgroup -S render 2>/dev/null
-addgroup -S sgx 2 >/dev/null
+addgroup -S sgx 2>/dev/null
 
 exit 0