[FIX] auth_signup: fix layout of reset password form

Since 12.0, the links on the login forms are no longer next to the
main button, but under it.

This commit reflects this change in the reset password form, which has
not been updated yet.

closes odoo/odoo#46798

X-original-commit: b71bf59d417983000592a226025637ee250c2bb8
Signed-off-by: Paul Morelle <madprog@users.noreply.github.com>

addons/auth_signup/views/auth_signup_login_templates.xml

@@ -91,8 +91,8 @@
                     <input type="hidden" name="redirect" t-att-value="redirect"/>
                     <input type="hidden" name="token" t-att-value="token"/>
                     <div class="clearfix oe_login_buttons">
-                        <div class="d-flex justify-content-between align-items-center small">
-                            <button type="submit" class="btn btn-primary btn-sm">Confirm</button>
+                        <button type="submit" class="btn btn-primary btn-block">Confirm</button>
+                        <div class="d-flex justify-content-between align-items-center small mt-2">
                             <a t-if="not token" t-attf-href="/web/login?{{ keep_query() }}">Back to Login</a>
                             <a t-if="invalid_token" href="/web/login">Back to Login</a>
                         </div>