monitor: fix setting promise-log symlink path

stack/monitor/buildout.hash.cfg

@@ -15,4 +15,4 @@
 # not need these here).
 [monitor2-template]
 filename = instance-monitor.cfg.jinja2.in
-md5sum = 86517ddccc86c76deaedf11066470550
+md5sum = b30c47a593299da9889035850a47c519

stack/monitor/instance-monitor.cfg.jinja2.in

@@ -153,7 +153,7 @@ password = ${monitor-instance-parameter:password}
 recipe = cns.recipe.symlink
 symlink =
   ${monitor-directory:promise-result} = ${monitor-directory:public}/promise
-  ${monitor-directory:promise-result} = ${monitor-directory:log}/promise
+  ${monitor-directory:promise-log} = ${monitor-directory:log}/promise
 
 [monitor-httpd-conf-parameter]
 listening-ip = ${monitor-instance-parameter:monitor-httpd-ipv6}