Make decimal properties work with mandatory validation clientside

src/Umbraco.Web.UI.Client/src/views/propertyeditors/decimal/decimal.html

@@ -5,6 +5,8 @@
                pattern="[\-0-9]+([,\.][0-9]+)?"
                class="umb-property-editor umb-number"
                ng-model="model.value"
+               ng-required="model.validation.mandatory"
+               aria-required="{{model.validation.mandatory}}"
                val-server="value"
                fix-number min="{{model.config.min}}" max="{{model.config.max}}" step="{{model.config.step}}" />