Addon list can be blank in multisite

[john-shaffer]

@DougBeney at #https://github.com/leonstafford/wp2static-addon-s3/issues/37#issuecomment-1152811649

There is still one quirk that is not fixed for multisites.

If you install the plugin and addons...then network activate for ALL sites on your network, the wp2static addons list will be fine on your primary multisite but for all others it will be blank.

The temporary fix is no network deactivate the plugins and then on each individual website's dashboard, enable the plugins.