TT#57513 Fix e6a31fa36: fix excaping error in 410_process-ngcp.yaml

Otherwise we have an error here:

> root@spce:~# /usr/share/ngcp-tests/testrunner
> ...
> Error: yaml: line 3: found unknown escape character

Change-Id: I377a5796754a9310148c8361cb397e54722c8cfa

templates/410_process-ngcp.yaml.tt2

@@ -16,7 +16,7 @@
 
 command:
 
-  "pgrep -c -f 'lua5\.. /usr/bin/prosody'":
+  "pgrep -c -f 'lua5\\.. /usr/bin/prosody'":
 [% IF is_proxy && prosody.enable == 'yes' && node_state == 'active' -%]
     exit-status: 0
     stdout: