core.cfg: fix sysconfdir detection trimming @ from debug.getinfo
core.cfg: fix sysconfdir detection trimming @ from debug.getinfo

Signed-off-by: Hisham Muhammad <f0958c370d7551796537ea709fd16ff14ea1be6f@gobolinux.org>

keplerproject/luarocks,luarocks/luarocks,luarocks/luarocks,luarocks/luarocks,keplerproject/luarocks,tarantool/luarocks,tarantool/luarocks,tarantool/luarocks,keplerproject/luarocks,keplerproject/luarocks