Modifying CONTENT_GAP_VERT_SCALE and other read-only properties of the FlatQuestion object raises a TypeScript error

[JaneSjs]

T20649 - Issue with Modifying Read-Only Properties in SurveyJS PDF Generator for Angular
https://surveyjs.answerdesk.io/internal/ticket/details/T20649

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survey-pdf/src/flat_layout/flat_question.ts

Line 17 in ed331da

public static readonly CONTENT_INDENT_SCALE: number = 1.0;

A TS compilation error occurs when using the code from the Customize PDF Forms demo.

import { FlatQuestion } from "survey-pdf";

// Decrease the horizontal indent of the question content
FlatQuestion.CONTENT_INDENT_SCALE = 0;
// Decrease the vertical indent of the question content
FlatQuestion.CONTENT_GAP_VERT_SCALE = 0.1;