[FIX] models: more than one prefetch in onchange

When a record fields are prefetched, the currently accessed record is
prefetched as well as PREFETCH_MAX (=1000) minus currenly accessed
records.

Since 439fa826 the id field was thought as "prefetched" but was not,
which caused that in an onchange, we would have a prefetching as follow
for 1200 records:

- get records 1-1000
- get record 1001 (1001-1200 INTERSECTION 1-999 (id) + 1001 (current))
- get record 1002 (1002-1200 INTERSECTION 1-999 (id) + 1002 (current))
- get record 1003 (1003-1200 INTERSECTION 1-999 (id) + 1003 (current))
- ...
- get record 1200 (1200 INTERSECTION 1-999 (id) + 1200 (current))

So we would do 201 queries instead of 2 when prefetching the records.

The added test without this change failed the query count with:

 "AssertionError: 284 not less than or equal to 5 : admin"

opw-1837548
opw-1837552
closes #24326

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