systemd: don't try to restart templates

If the user has template services in their systemd configuration, these
can't be restarted, and will produces warnings during the activation
phase.  Avoid those warnings by skipping any uninstantiated templates
when looking for services to start or stop.

modules/systemd-activate.sh

@@ -34,7 +34,7 @@ function systemdPostReload() {
     touch "$oldServiceFiles"
   else
     find "$oldUserServicePath" \
-      -maxdepth 1 -name '*.service' -exec basename '{}' ';' \
+      -maxdepth 1 -name '*.service' \! -name '*@.service' -exec basename '{}' ';' \
       | sort \
       > "$oldServiceFiles"
   fi
@@ -43,7 +43,7 @@ function systemdPostReload() {
     touch "$newServiceFiles"
   else
     find "$newUserServicePath" \
-      -maxdepth 1 -name '*.service' -exec basename '{}' ';' \
+      -maxdepth 1 -name '*.service' \! -name '*@.service' -exec basename '{}' ';' \
       | sort \
       > "$newServiceFiles"
   fi