[FIX] project: correctly display the 'Assign to Me' button

Priori to this fix:

    * The domain provided to the invisible member of the attrs was wrong
      as it was using the '=' operator.

After this fix:

    * The domain provided to the invisible member of the attrs is using
      the 'in' operator.

task-2691562

closes odoo/odoo#79800

X-original-commit: e69012541dbba5a98a3b847c78b2ac17455601b3
Signed-off-by: Laurent Stukkens (ltu) <ltu@odoo.com>

addons/project/views/project_views.xml

@@ -809,7 +809,7 @@
                     <field name="rating_count" invisible="1"/>
                     <header>
                         <button name="action_assign_to_me" string="Assign to Me" type="object" class="oe_highlight"
-                            attrs="{'invisible' : &quot;[('user_ids', '=', uid)]&quot;}" data-hotkey="q"/>
+                            attrs="{'invisible' : &quot;[('user_ids', 'in', uid)]&quot;}" data-hotkey="q"/>
                         <field name="stage_id" widget="statusbar" options="{'clickable': '1', 'fold_field': 'fold'}" attrs="{'invisible': [('project_id', '=', False), ('stage_id', '=', False)]}"/>
                     </header>
                     <div class="alert alert-info oe_edit_only mb-0" role="status" attrs="{'invisible': ['|', ('recurring_task', '=', False), ('recurrence_id', '=', False)]}">