Add dependency on path

[markabur]

Without Path module enabled, I get a fatal error when saving a node with content in field collection fields.

[aheathgr]

Thanks for the report, @markabur ! Looks like logic that checked for path (in Drupal, pathauto) being enabled got lost in the migration to Backdrop. This PR should fix that.

[markabur]

Looks good, thanks!