added ctrl+s shortcut for submit button in dialog

Author: skttl

src/Our.Umbraco.DocTypeGridEditor/Web/UI/App_Plugins/DocTypeGridEditor/Views/doctypegrideditor.dialog.html

@@ -41,6 +41,7 @@
                 <umb-button type="button"
                             button-style="action"
                             label-key="general_submit"
+                            shortcut="ctrl+s"
                             action="vm.submit(model)">
                 </umb-button>
             </umb-editor-footer-content-right>