(core) Disallow the combination of Public Edit access and granular ACLs.

Summary:
- When Public Edit access is enabled, Access Rules page shows a warning and
  prevents saving rules.
- When any ACL rules are present, attempts to set Public access to Editor role
  get downgraded to Viewer role, with a warning notification.
- No checks are made on the server side, so the combination may be achieved via
  the API (but we may block it in the future).

Test Plan: Added a test case.

Reviewers: paulfitz

Reviewed By: paulfitz

Differential Revision: https://phab.getgrist.com/D2767

app/client/models/NotifyModel.ts

@@ -96,7 +96,7 @@ export class Notification extends Expirable implements INotification {
 
   constructor(_opts: INotifyOptions) {
     super();
-    this.options = defaults({}, _opts, this.options)
+    this.options = defaults({}, _opts, this.options);
 
     if (this.options.expireSec > 0) {
       const expireTimer = setTimeout(() => this.expire(), 1000 * this.options.expireSec);