[IMP] web_remember_tree_column_width: adjust SCSS selector

Previously, only columns with the class o_column_sortable had the custom
SCSS applied to them. As a result, columns like HTML were not sortable
and didn't benefit from the custom SCSS.

This commit made changes to the SCSS selector to include all table's
columns in the list view. However, the record selector (the first
checkbox column) and the column optional (the last column) that have the
class o_list_controller were excluded to avoid unexpected behavior.

web_remember_tree_column_width/static/src/scss/main.scss

@@ -1,4 +1,4 @@
-th.o_column_sortable {
+div.o_list_renderer > table.o_list_table th:not(.o_list_controller) {
     max-width: none !important;
     min-width: 0 !important;
 }