[FIX] sale_stock: fix forecast icon

This commit fixes an unconsistent forestack icon within the `sale_stock`
module.

Prior to this commit, the forecast icon was using a `text-primary` class,
making it unconsistent regarding the other forecast icons.

We also add a missing `cursor-pointer` class to fix the improve the hover
state and the visual feedback of the link.

task-3582145

closes odoo/odoo#153618

X-original-commit: e3c7273dbd8c9945bd5b983e864bbb0530114df4
Signed-off-by: Quentin Wolfs (quwo) <quwo@odoo.com>

addons/sale_stock/static/src/widgets/qty_at_date_widget.xml

@@ -5,7 +5,7 @@
         <a t-att-tabindex="props.record.data.display_qty_widget ? '0' : '-1'"
             t-on-click="showPopup"
             t-att-class="!props.record.data.display_qty_widget ? 'invisible' : ''"
-            t-attf-class="fa fa-area-chart {{ calcData.forecasted_issue ? 'text-danger' : 'text-primary' }}"
+            t-attf-class="fa fa-area-chart cursor-pointer {{ calcData.forecasted_issue ? 'text-danger' : '' }}"
         />
     </t>