adding back fa- to icons so can more easily find them in code and removing helper function that added fa- automatically

ayanova/src/views/home-dashboard.vue

@@ -40,7 +40,7 @@ export default {
   beforeCreate() {
     window.$gz.eventBus.$emit("menu-change", {
       isMain: true,
-      icon: "tachometer-alt",
+      icon: "fa-tachometer-alt",
       title: window.$gz.translation.get("Dashboard"),
       helpUrl: "form-home-dashboard"
     });