[IMP] website_slides: use float_time widget on total_time

In this commit we use the float_time widget on total_time field in order to
achieve an amazing wow onboarding back2basics effect.

closes odoo/odoo#42360

Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>

addons/website_slides/views/slide_channel_views.xml

@@ -136,7 +136,7 @@
                                         <field string="Rating" name="rating_avg" widget="field_float_rating"/>
                                         <label for="total_time" string="Watch Time"/>
                                         <div>
-                                            <field name="total_time"/>
+                                            <field name="total_time" widget="float_time" />
                                             <span class="ml-2">Hours</span>
                                         </div>
                                     </group>