[FIX] base: ir_sequence UI

ir_sequence is currently broken when trying to view the list of
sequences (if there are any in the system) and when trying to create
one:

During the sql-thingie, I prepared the `params` local to differentiate
the params to provide in both cases of a conditional, then promptly
forgot to do that, so no parameter is provided when one is needed,
which breaks... on every pg >= 10 (which at this point is probably all
of them).

Correct this error.

Furthermore, the "computes are onchange" was not impacted on
`_get_number_next_actual`. On creation, this leads to trying to format
a NewId as a number. If that is just defaulted, we will then try and
`_predict_nextval` for a sequence which doesn't exist in the database.

Just yield `0` if the sequence hasn't been created yet.

closes odoo/odoo#56397

Reported-by: @youring
Signed-off-by: Xavier Morel (xmo) <xmo@odoo.com>

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