Make grid JS loadAsyncData() method truly async

not sure what this does but it seems to work, we'll see

tailbone/templates/grids/buefy.mako

@@ -484,7 +484,10 @@
                       ...this.getFilterParams()}
           },
 
-          loadAsyncData(params, callback) {
+          ## TODO: i noticed buefy docs show using `async` keyword here,
+          ## so now i am too.  knowing nothing at all of if/how this is
+          ## supposed to improve anything.  we shall see i guess
+          async loadAsyncData(params, callback) {
 
               if (params === undefined || params === null) {
                   params = new URLSearchParams(this.getBasicParams())