mod_invites_register_web: Fix loading resources from relative paths Both module:get_option_path and module:load_resource makes the path relative to the plugin resource directory, so when running form a source checkout where this path is relative, the path was expanded relative to itself, becoming duplicated.

This module authenticates server-to-server connections by looking for an already established connection that uses the exact same certificate, reusing
the earlier validation results and letting Prosody skip performing slower validation methods such as [POSH][mod_s2s_auth_posh] twice.