community/autologin: remove pam references to gnome/kde keyrings

According to https://wiki.gnome.org/Projects/GnomeKeyring/Pam/Manual:

Gnome Keyring authentication module retrieves password obtained by previous module in PAM stack and stores it for later use. When no password was obtained this module does nothing and returns success.

Since autologin is starting the user session without asking a password it will do nothing.

On the other hand the pam_kwallet*.so modules are not included in Alpine or PostmarketOS (at least I couldn't find them), and probably would have the same problem as gnome (they need a password for being able to unlock the keyring).