[FIX] mail: attachment button in chatter mobile should not wrap

Before this commit, the attachment button had icon and label on
different lines in mobile, which made the chatter topbar bigger
in height than it should.

closes odoo/odoo#123098

X-original-commit: 1afe20789fcf197ccc0a240d39d57d10e1f1454a
Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>

addons/mail/static/src/web/chatter.xml

@@ -145,7 +145,7 @@
 </t>
 
 <t t-name="mail.Chatter.attachFiles" owl="1">
-    <button class="btn btn-link text-action px-1" aria-label="Attach files" t-att-class="{ 'my-2': !props.compactHeight }" t-on-click="onClickAddAttachments">
+    <button class="btn btn-link text-action px-1 d-flex" aria-label="Attach files" t-att-class="{ 'my-2': !props.compactHeight }" t-on-click="onClickAddAttachments">
         <i class="fa fa-paperclip fa-lg me-1"/>
         <span t-if="attachments.length > 0" t-esc="attachments.length"/>
         <i t-if="!state.thread.areAttachmentsLoaded and state.thread.isLoadingAttachments" class="fa fa-circle-o-notch fa-spin" aria-label="Attachment counter loading..."/>