[IMP] website: review "Separator" snippet color

Part of https://github.com/odoo/odoo/pull/52698
task-2210730

closes odoo/odoo#52698

Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>
Co-authored-by: qsm-odoo <qsm@odoo.com>

addons/website/static/src/snippets/s_hr/000.scss

@@ -4,7 +4,8 @@
     hr {
         padding: 0;
         border: 0;
-        border-top: 1px solid inherit;
+        border-top: 1px solid currentColor;
         margin: 0;
+        color: inherit;
     }
 }

addons/website/views/snippets/s_hr.xml

@@ -3,7 +3,7 @@
 
 <template id="s_hr" name="Separator">
     <div class="s_hr text-left pt32 pb32">
-        <hr class="border-600 w-100 mx-auto" style="border-top-width: 1px; border-top-style: solid;"/>
+        <hr class="w-100 mx-auto" style="border-top-width: 1px; border-top-style: solid;"/>
     </div>
 </template>