contrib: rename nitcc/tests/package.ini to plural

So that the `tests` directory is not identified as a package by the loader

Signed-off-by: Jean Privat <jean@pryen.org>

diff --git a/contrib/nitcc/tests/package.ini b/contrib/nitcc/tests/packages.ini
similarity index 100%
rename from contrib/nitcc/tests/package.ini
rename to contrib/nitcc/tests/packages.ini