[DataGrid] Fix loader flag from useDemoData hook#1279

Merged

DanailH merged 2 commits intomui:masterfrom DanailH:fix/DataGrid-1276-loader-demo

Mar 25, 2021

+1

Commits on Mar 23, 2021

Fix loader flag from useDemoData hook
DanailH
committed

Commits on Mar 24, 2021

Keep initial loading state to true
DanailH
committed