Reduce utils.Cfg references (#7650)

* app.UpdateConfig method

* test fix

* another test fix

* the config override option as-was is just error prone, remove it for now

* derp

api/license.go

@@ -24,7 +24,7 @@ func (api *API) InitLicense() {
 
 func addLicense(c *Context, w http.ResponseWriter, r *http.Request) {
 	c.LogAudit("attempt")
-	err := r.ParseMultipartForm(*utils.Cfg.FileSettings.MaxFileSize)
+	err := r.ParseMultipartForm(*c.App.Config().FileSettings.MaxFileSize)
 	if err != nil {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
 		return