The default value of #f for the ‘file-system’ field is invalid and would
trigger a type error when running ‘guix system search’.
* gnu/services/admin.scm (<resize-file-system-configuration>)[file-system]:
Remove default value.
(resize-file-system-service-type)[default-value]: Remove.
* doc/guix.texi (Miscellaneous Services): Adjust accordingly.
Change-Id: If73f8923f49d38827059ba98bd53636a7f3917fe