[FIX] stock: display the forecast symbol on outgoing SM

To reproduce the issue:
1. Create a storable product P
2. Update the on-hand quantity: 5 x P
3. Create a planned delivery order with 4 x P
    - Note: once saved, the forecast symbole is green
4. On the delivery order, set the quantity to 5 and save

Error: The symbol is now red, which is incorrect: there are 5 available
P in the stock

The color condition is incorrect, when `forecast_availability` is equal
to zero, it means that there will be just the right quantity:
https://github.com/odoo/odoo/blob/892232b5aef42dd2706cb9d1d027b1c463ca50dd/addons/stock/models/stock_move.py#L446-L448

task-2822157

X-original-commit: b49577d
Part-of: odoo#94292

Author: adwid

addons/stock/views/stock_picking_views.xml

@@ -390,9 +390,9 @@
                                     <field name="product_packaging_id" groups="product.group_stock_packaging"/>
                                     <field name="product_uom_qty" string="Demand" attrs="{'column_invisible': [('parent.immediate_transfer', '=', True)], 'readonly': ['|', ('is_initial_demand_editable', '=', False), '&amp;', '&amp;', ('show_operations', '=', True), ('is_locked', '=', True), ('is_initial_demand_editable', '=', False)]}"/>
                                     <button type="object" name="action_product_forecast_report" title="Forecast Report" icon="fa-area-chart" 
-                                        attrs="{'invisible': ['|', ('forecast_availability', '&lt;=', 0), '|', ('parent.immediate_transfer', '=', True), '&amp;', ('parent.picking_type_code', '=', 'outgoing'), ('state', '!=', 'draft')]}"/>
+                                        attrs="{'invisible': ['|', ('forecast_availability', '&lt;', 0), '|', ('parent.immediate_transfer', '=', True), '&amp;', ('parent.picking_type_code', '=', 'outgoing'), ('state', '!=', 'draft')]}"/>
                                     <button type="object" name="action_product_forecast_report" title="Forecast Report" icon="fa-area-chart text-danger" 
-                                        attrs="{'invisible': ['|', ('forecast_availability', '&gt;', 0), '|', ('parent.immediate_transfer', '=', True), '&amp;', ('parent.picking_type_code', '=', 'outgoing'), ('state', '!=', 'draft')]}"/>
+                                        attrs="{'invisible': ['|', ('forecast_availability', '&gt;=', 0), '|', ('parent.immediate_transfer', '=', True), '&amp;', ('parent.picking_type_code', '=', 'outgoing'), ('state', '!=', 'draft')]}"/>
                                     <field name="forecast_expected_date" invisible="1"/>
                                     <field name="forecast_availability" string="Reserved"
                                         attrs="{'column_invisible': ['|', '|', ('parent.state', 'in', ['draft', 'done']), ('parent.picking_type_code', '!=', 'outgoing'), ('parent.immediate_transfer', '=', True)]}" widget="forecast_widget"/>