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/ToolBoxBrowser/uChildForm.pas

@@ -237,6 +237,7 @@ end;
 
 procedure TChildForm.BrowserCreatedMsg(var aMessage : TMessage);
 begin
+  CEFWindowParent1.UpdateSize;
   Chromium1.LoadURL(FHomepage);
 end;