=== ISSUE ===
If you open the calendar module with an event with attendees, the status
button showing if the user accepted the invitation or not is missing a
left margin.
=== AFTER ===
We add a `ms-1` class to the buttons to space them correctly.
task-3389679
part of task-3326263
closesodoo/odoo#127976
X-original-commit: 86595f718ec5824d53f49ae7495677dd31551d57
Signed-off-by: Pierre Paridans (app) <app@odoo.com>