This commit fixes the style of the close chatter button in the attachment view to match new Milk button design It also fixes a no spacing issue between `.o-mail-Chatter-close` and `.o-mail-Chatter-follow` task-3415853 part of task-3326263 closes odoo/odoo#127978 X-original-commit: f655bdfda5caf6608d4364f49bdddf25f3abf201 Signed-off-by: Pierre Paridans (app) <app@odoo.com>