rpm: fix meminfo-writer setup during system installation

We have no control over package installation, so it can happen to be
before qubes-release got installed. Simply enable both dom0 and VM
services - they contains relevant start conditions.

rpm_spec/qubes-utils.spec

@@ -52,13 +52,10 @@ make all
 make install DESTDIR=%{buildroot}
 
 %post
-if [ -r /etc/qubes-release ]; then
 # dom0
 /bin/systemctl enable qubes-meminfo-writer-dom0.service > /dev/null 2>&1
-else
 # VM
 /bin/systemctl enable qubes-meminfo-writer.service > /dev/null 2>&1
-fi
 
 %postun
 if [ $1 -eq 0 ]; then