[FIX] web: search view: autocomplete on datetime fields
[FIX] web: search view: autocomplete on datetime fields

... gives wrong values due to the timezone.

For instance, let's assume that the browser timezone of the user
is UTC+2, and the user types 10/09/2017 10:00:00 in a searchview
with a datetime field in its arch (i.e. which autocompletes on a
datatime field). Before this rev., the suggested value was
10/09/2017 08:00:00, i.e. the timezone offset was substracted from
the value.

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