In Odoo 16, we redesigned the `Accounting > Miscellaneous` menu to
provide a convenient interface for inspecting any journal entry or
journal item.

As such, it no longer makes sense to call it 'Miscellaneous'.

This commit aligns the name with the new functionality.

We also remove the default filter of the 'Journal Entries' view, which
restricted it to miscellaneous entries, and replace it with a filter
on posted entries, consistent with the purpose of conveniently
inspecting the accounting journals.

closes odoo/odoo#106687

Task: 3083921
Signed-off-by: Brice Bartoletti (bib) <bib@odoo.com>