TT#122035 Fix for "Adapt to allow victoria-metrics running"

Fixes commit 837cde059a

The current output after the last change is "1", which then is evaluated
as different from "true" (see below), so set "true"/"false" explicitly.

  Service: victoria-metrics.service: enabled: doesn't match, expect: [1] found: [true]

Change-Id: If1fec840e70e26a352516ce2ceee983d0f0d74fe

templates/500_init-daemons-dabian.yaml.tt2

@@ -98,5 +98,5 @@ service:
     running: [% monitoring.backend == 'influxdb' ? 'true' : 'false' %]
 
   victoria-metrics.service:
-    enabled: [% monitoring.backend == 'prometheus' && monitoring.prometheus_server == 'victoria-metrics' %]
-    running: [% monitoring.backend == 'prometheus' && monitoring.prometheus_server == 'victoria-metrics' %]
+    enabled: [% monitoring.backend == 'prometheus' && monitoring.prometheus_server == 'victoria-metrics' ? 'true' : 'false' %]
+    running: [% monitoring.backend == 'prometheus' && monitoring.prometheus_server == 'victoria-metrics' ? 'true' : 'false' %]