The archive groups feature allows the user to have fast access to
records of a given month, under its details information.
But since the details section isn't shown anymore on portal sub-pages,
the feature is computed for nothing on (most) pages.
Removing this computation avoids a read_group call on portal subpages
(multiple potential queries).
This commit disables the feature until a total removal in master.
my_details is only truthy on the /my/account portal page, where no
archive_groups is given anyway (and the value is set to True only in the
rendered tempate itself).
X-original-commit: 40c57fafdd5651a522891ab68affe38933ea5202