make unpublish button in overlay appear as button-style warning

src/Umbraco.Web.UI.Client/src/common/directives/components/content/edit.controller.js

@@ -442,6 +442,7 @@
                     variants: $scope.content.variants, //set a model property for the dialog
                     skipFormValidation: true, //when submitting the overlay form, skip any client side validation
                     submitButtonLabelKey: "content_unpublish",
+                    submitButtonSTYLE: "warning",
                     submit: function (model) {
 
                         model.submitButtonState = "busy";

src/Umbraco.Web.UI.Client/src/views/components/overlays/umb-overlay.html

@@ -67,7 +67,7 @@
 
                 <umb-button
                     alias="overlaySubmit"
-                    button-style="success"
+                    button-style="{{model.submitButtonStyle || 'success'}}"
                     label-key="{{model.submitButtonLabelKey}}"
                     label="{{model.submitButtonLabel}}"
                     ng-if="model.submit && model.hideSubmitButton !== true"