Make inlines to work corectly with non sortable inlines

If there are two inlines from the same type (stacked and stacked or tabular and tabular) and one of them is non sortable, then current implementation try to make it sortable but when try to reorder backend trows error 500.

I've changed javascript for stacked inlines and tabular inlines to work only at sortable inlines.
I also changes sample project to have this configuration for easy reprodusing the situatiuon.