[IMP] hr_timesheet: rename Timer.js to timer_mixin.js.

- Before this commit file name is Timer.js which create issue in macOS
due to non case-sensitive harddisk partition. So file renamed to timer_mixin.js

closes #42232

Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>

addons/hr_timesheet/views/assets.xml

@@ -5,7 +5,7 @@
             <link type="text/scss" href="/hr_timesheet/static/src/scss/timer_button.scss" rel="stylesheet"/>
             <script type="text/javascript" src="/hr_timesheet/static/src/js/task_with_hours.js"></script>
             <script type="text/javascript" src="/hr_timesheet/static/src/js/timer.js"/>
-            <script type="text/javascript" src="/hr_timesheet/static/src/js/Timer.js"/>
+            <script type="text/javascript" src="/hr_timesheet/static/src/js/timer_mixin.js"/>
             <script type="text/javascript" src="/hr_timesheet/static/src/js/timesheet_uom.js"/>
             <script type="text/javascript" src="/hr_timesheet/static/src/js/timer_toggle_button.js"/>
             <script type="text/javascript" src="/hr_timesheet/static/src/js/timesheet_list_view.js"/>