[FIX] web: improve automatic creation of new lines in x2many in forms

This commit fixes a few issues with the previous implementation of the
automatic addition of new lines in x2many inside forms

1. Before this commit, when there is a change of mode in a formview
`edit` -> `readonly` -> `edit`, there may be some cases that
mistakenly and automatically opens a modal.

This case occurs in a form view with a x2many field whose 1st inner
focusable element opens a modal (e.g. "Add an item").

In `edit` mode:
	1. Open this modal from the x2many
	2. Close the modal
	3. Change mode to `readonly`
	4. Change mode to `edit`
> the same modal is automatically open.

This is due to the tracking of the last activated field that persists
after a change of mode. Since the last activated field in the 1st
`edit` is the x2many, it is granted the focus at the beginning of the
2nd `edit`, which automatically opens the modal.

This commit fixes the issue by resetting the tracking of the last
activated field when there is a change of mode. As a result, at the
beginning of the 2nd `edit`, the focus should always be on the 1st
field.

2. Before this commit, if the focus was moved out of the form (to a modal
for instance) then back, the form would re-activate the last field, which
is the x2many and would re-add a new line. This behavior is not correct
and now going back from a modal to a form does not add a new line.

Co-authored-by: Alexandre Kühn <aku@odoo.com>

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