Extra UpdateSize call

- Added an extra call to TCEFWindowParent.UpdateSize to the demos when the browser is fully created.

- Also added a fix for Delphi 10.2 compatibility in the SchemeRegistrationBrowser.

demos/CustomResourceBrowser/uMainForm.pas

@@ -130,6 +130,7 @@ end;
 
 procedure TMainForm.BrowserCreatedMsg(var aMessage : TMessage);
 begin
+  ChromiumWindow1.UpdateSize;
   AddressBarPnl.Enabled := True;
 end;