There is a not that simple logic involving column widths in list
views, in order to optimize the space available for columns with
arbitrary long content (e.g. char or many2one fields). For that
reason, some columns have a fixed width. Before this commit, the
first column, containing record selectors, had no fixed width,
whereas it should be set to 40px.
This commit also renames o_list_controller.scss into
o_list_renderer.scss as this file only contains renderer rules.
closesodoo/odoo#100522
Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>