dnf-context: Prepare for disabling the filelists by default

Aligned with changes in `Repo`, the default behavior will be not to download filelists.

libdnf/dnf-context.cpp

@@ -364,6 +364,7 @@ dnf_context_init(DnfContext *context)
     priv->install_root = g_strdup("/");
     priv->check_disk_space = TRUE;
     priv->check_transaction = TRUE;
+    // TODO(jkolarik): Remove when the system-wide change proposal is accepted
     priv->enable_filelists = TRUE;
     priv->write_history = TRUE;
     priv->state = dnf_state_new();