Revert "tests/test-libstoreconsumer: Ignore config"

This reverts commit 62feb5ca09263c78ddb692836228223e5b58d3ae.

It runs as part of the functional tests, which control the environment,
solving some of the problems a default config has when run in the
sandbox.

tests/functional/test-libstoreconsumer/main.cc

@@ -15,8 +15,7 @@ int main (int argc, char **argv)
 
         std::string drvPath = argv[1];
 
-        // This small program is a test, so we do not want user config to interfere.
-        initLibStore(false);
+        initLibStore();
 
         auto store = nix::openStore();