Change `const service_regex` to cope with linebreaks

[manuelbb-upb]

This is a follow-up to my previous (erroneous) issue.

My service was not detected.
The file I was provided has it defined like this:

service ServiceNAME
{
  …
}

The file is scanned line by line and const service_regex requires { at the end of the line (which is why my service was not detected).

It works if I use

const service_regex = r"service\s(\S*)[\s]*\{*.*"

PS: in detect_services, there is an superfluous strip(line) when we are checking if it starts with "service".