Remove launchDeleteForm JS function

- All should be consolidated upon launchModalForm
- StockItem delete now uses this

InvenTree/stock/templates/stock/item.html

@@ -194,7 +194,7 @@
     {% endif %}
 
     $("#stock-delete").click(function () {
-        launchDeleteForm(
+        launchModalForm(
                          "{% url 'stock-item-delete' item.id %}",
                          {
                              redirect: "{% url 'part-stock' item.part.id %}"

InvenTree/stock/templates/stock/item_delete.html

@@ -1,5 +1,11 @@
+{% extends "modal_delete_form.html" %}
+
+{% block pre_form_content %}
+
+<div class='alert alert-danger alert-block'>
 Are you sure you want to delete this stock item?
-
 <br>
-
 This will remove <b>{{ item.quantity }}</b> units of <b>{{ item.part.full_name }}</b> from stock.
+</div>
+
+{% endblock %}