[FIX] mail: less visible non-self message reaction in dark theme

When message has emoji reactions, they have slightly different
visual whether the current user has reacted or not:
When the user has reacted, this is highlighted.

This works great in white them, but in dark theme the non-self
reacted visual was more highlighted, which goes against the
intend of highlighting self-reactions more. The problem is that
non-self reactions are too distracting in dark theme, which isn't
the case in white theme, This comes from borders being too visible.

The color of default `border` is too much in dark theme. This commit
fixes the issue by using `border-secondary`, which has reduced
opacity in dark theme. In white theme, this is unchanged.

closes odoo#190052

Signed-off-by: Didier Debondt (did) <[email protected]>

addons/mail/static/src/core/common/message_reaction_list.xml

@@ -12,7 +12,7 @@
     <t t-name="mail.MessageReactionList.button">
         <button class="position-relative o-mail-MessageReaction btn d-flex p-0 border rounded-2 mb-1 fs-5 px-1 gap-1 align-items-center" t-on-click="() => this.onClickReaction(props.reaction)" t-on-contextmenu="onContextMenu" t-on-mouseenter="loadEmoji" t-ref="reactionButton" t-att-class="{
             'o-selfReacted border-primary text-primary fw-bold': hasSelfReacted(props.reaction),
-            'bg-view': !hasSelfReacted(props.reaction),
+            'bg-view border-secondary': !hasSelfReacted(props.reaction),
             'ms-1': env.inChatWindow and env.alignedRight,
             'me-1': !(env.inChatWindow and env.alignedRight),
         }">