[FIX] web: read records up to list limit

Fine-tuning of commit e7fab234201e357da52c3576ad2e8fc9ceee9359
In a one2many with more than one page with a limit of k records, add a line l.
It increments the list limit to k+1. Remove a line above (of index <= k).
It will try to load a line l' to replace it, that it will find on page 2.
However when deciding if it should read missing fields on that record, it will
scan at most u records, skipping virtual ids.
Here u is the min between the current number of lines and the list limit
without the temporary increase due to the added record.
Since there are at least two pages, u = k.
However since l is in the list at index k, then l' won't be read, and since it
was on page 2 its data hasn't been loaded.
Therefore the js would traceback when trying to evaluate it.

opw 1913361

closes odoo/odoo#29338

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