[FIX] mail: wrap long user names on direct messaging search

Before commit:

Long user names in direct messaging search are not wrapped, leading to
UI display issues.

After commit:

Resolved the issue where long user names were not properly wrapped in direct
messaging search. Now, when a user name exceeds the allotted space, it is
 truncated.

Task-3748791

closes odoo/odoo#160141

X-original-commit: eaf0e073ef8689629541de33e9bcf167f0e6b8e8
Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>

addons/mail/static/src/discuss/core/web/channel_selector.xml

@@ -29,7 +29,7 @@
 
 <t t-name="discuss.ChannelSelector.chat">
     <ImStatus t-if="option.partner" persona="option.partner"/>
-    <strong class="px-2 py-1 align-self-center flex-shrink-0 text-truncate">
+    <strong class="px-2 py-1 align-self-center text-truncate">
         <t t-esc="option.label"/>
     </strong>
 </t>