[debian] config dir: should be /etc not /usr/local/etc (zsv v1.3.0)

[iamazeem]

Bug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1128458
Severity: serious

Policy: https://www.debian.org/doc/debian-policy/ch-files.html#configuration-files

According to Location (https://www.debian.org/doc/debian-policy/ch-files.html#location):

Any configuration files created or used by your package must reside in /etc. If there are several, consider creating a subdirectory of /etc named after your package.

If your package creates or uses configuration files outside of /etc, and it is not feasible to modify the package to use /etc directly, put the files in /etc and create symbolic links to those files from the location that the package requires.

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Related: zsv --help: /usr/local/etc/zsv: Permission denied

Bug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1128457

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@liquidaty: Please take a look at this. Need your input. Thanks!