[v3] navbar-fixed-* don't get right padding on modal open

Created by: iamandrewluca

When opening a modal and there is a vertical scrollbar on body, body gets added a pading right of scrollbar width and overflow hidden,
because without it content will move left and right.

Same applies for navbar-fixed-top and navbar-fixed-bottom,
When body has overflow hidden, navbar-fixed-* is moving left and right on modal toggle