Change parameters for rcmwidget extension for amp-ad

### Summary

Hi!
One of parameters (`projectId`) of out widget is outdated and should be removed from the list. And I want to contribute this change into amp-ad.

~And 1 param should be added to required params: `layoutType`.~ We don't need it anymore.

Widget is used to place dynamic blocks with the most relevant materials on Rambler sites.

### Design Document

_No response_

### Motivation

One of params became unnecessary, so I want to remove it from the list of params.

### Alternative Solutions

no

### Launch Tracker

_No response_

### Notifications

/cc @ampproject/wg-approvers

The issue identifies the rcmwidget configuration for the amp-ad extension but names no file or test. Start by locating the rcmwidget parameter definition and confirm how projectId is listed; verify that layoutType remains excluded. Done means the parameter list no longer includes projectId and the relevant checks still pass.

Written by the indexing model from the issue text.