Before this commit, when content of dialog was long, content
overflow but was not scrollable, which makes bottom unreachable,
which is especially a problem when buttons are at the bottom.
This problem solves the issue by adding classname `modal` to
dialog. This classname puts proper handling of overflow of
dialog and its content.
Also remove `align-items-center` so that top doesn't overflow
in isolation from the rest of content, which made top unreachable.
Task-2973866
closesodoo/odoo#99865
X-original-commit: 9f4495aa065da5e94d6ccd007c9f26b7d755f140
Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>
Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>