systemd/systemd-services: make shellcheck happy (MR 5070)

Fix for:
  In systemd-services.trigger line 14:
      systemctl $cmd $service
                ^--^ SC2086 (info): Double quote to prevent globbing and word splitting.
                     ^------^ SC2086 (info): Double quote to prevent globbing and word splitting.

extra-repos/systemd/systemd-services/APKBUILD

@@ -7,7 +7,7 @@
 pkgname=systemd-services
 # 1. bump pkgver
 pkgver=5
-pkgrel=0
+pkgrel=1
 pkgdesc="Systemd service files"
 url="https://postmarketos.org"
 arch="noarch"

extra-repos/systemd/systemd-services/systemd-services.trigger

@@ -11,7 +11,7 @@ fi
 
 while read -r cmd service; do
     echo "=> $cmd $service"
-    systemctl $cmd $service
+    systemctl "$cmd" "$service"
 done < /run/rc-update.failed
 
 rm -f /run/rc-update.failed