resolve #6734 Move a piece of code from the PropertyGridEditor.showModalPropertyEditor function (#6739)

Co-authored-by: OlgaLarina <olga.larina.dev@gmail.com>

Author: OlgaLarina

packages/survey-creator-core/src/property-grid/index.ts

@@ -36,7 +36,6 @@ import {
   settings as creatorSettings
 } from "../creator-settings";
 import { QuestionFactory } from "survey-core";
-import { defaultCss } from "survey-core";
 import { SurveyHelper } from "../survey-helper";
 import { ISurveyPropertyGridDefinition } from "../question-editor/definition";
 import { parsePropertyDescription } from "./description-parser";
@@ -1444,9 +1443,6 @@ export abstract class PropertyGridEditor implements IPropertyGridEditor {
       options
     );
     if (!surveyPropertyEditor) return null;
-    if (property.type !== "condition") {
-      surveyPropertyEditor.editSurvey.css = defaultCss;
-    }
     if (question.isReadOnly) {
       surveyPropertyEditor.editSurvey.mode = "display";
     }