[Vue] Redundant class imports in vue wrappers

[SergeyMaltsev]

Forum post

Wrapper's code

import { AjaxStore, Base, Column, ColumnStore, Container, DragHelper, Editor, ExportDialog, Field, Grid, GridBase, GridLocation, Layout, Mask, Menu, MenuItem, Model, Panel, Popup, Rectangle, Row, ScrollManager, Scroller, StateProvider, Store, SubGrid, Tool, Tooltip, Widget } from '@bryntum/grid';

Should be just

import { Grid } from '@bryntum/grid';