Remove the defaultread access for /hippo:modules

The repository defaultread domain should not need to provide (readonly) access to /hippo:configuration/hippo:modules

The only usage I'm aware of is the CMSAutoExportPlugin and (console) AutoExportPlugin, which need to read and update the autoexport:enabled of the autoexport module config.

For this, a new (cms provided) domain-autoexport-config will be setup, providing only the above, and the (repository provided) autoexport-domain configuration will be dropped.

Then, the defaultread domain no longer need to provide access to the /hippo:modules.