[FIX] web: pivot unload filter, reset, load another filter

On a pivot view with a default filter which has column and row groupbys
Remove the filter
Collapse all columns and rows
Activate another Filter from favorite which has a column groupby at least

Before this commit, the columns were not displayed in the DOM, though RPC's
and internal data were actually correct
This was because we considered the changes had been done "in place"
taking the old tree to build the new one for the columns
when really, we should have recomputed the column tree

After this commit, the columns display the group we want

OPW 1935155

closes odoo/odoo#31247

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