TT#152101 Fix d527f998f3 regarding syntax of 135_filesys-logfiles.yaml

Otherwise the resulting file isn't valid json syntax:

| root@sp1:~# goss --gossfile /etc/ngcp-system-tests/goss.yaml --vars /tmp/ngcp-system-tests.1O3urIHya7.yaml validate --format tap
| Error: could not read json data in /etc/ngcp-system-tests/135_filesys-logfiles.yaml: could not unmarshal "file:\n\n  /var/log/messages:\n
| [...]

Change-Id: I3a99570e5069553411a574f02fcd95355a9e3e7f

templates/135_filesys-logfiles.yaml.tt2

@@ -108,7 +108,7 @@ command:
 
 # optionally existing subdirectories
 
-  [% dir = '/var/log/ngcp/ngcp-rtcengine/' -%]
+[% dir = '/var/log/ngcp/ngcp-rtcengine/' -%]
   "if test -e [% dir %]; then find [% dir %] -maxdepth 1 -type f -size +0 -perm /o+rwx; fi":
     exit-status: 0
     stdout: