Fix bad variable name

tmpl/alertmanager.yml

@@ -75,8 +75,8 @@ route:
     %for sroute in %%getVar('alSubRoute',[])
       %if %%sroute == %%rt
     - match:
-        %%{rt.alSubRouteSource}: %%{rt.alSubRouteMatchValue}
-      receiver: %%rt.alSubRouteMatchRcv
+        %%{sroute.alSubRouteMatchSource}: %%{sroute.alSubRouteMatchValue}
+      receiver: %%sroute.alSubRouteMatchReceiver
       %end if
     %end for
   %end if