Auto position strategy use wrong animation when flipped

[wnvko]

Description

In IgxOverlay when using AutoPositionStrategy in case the content is flipped, e.g. initially should show in down direction, but there is not space and it shows in upper direction, the animation is not changed.

• igniteui-angular version: 9.1.x; 10.1.x; 10.2.x
• browser: all

Steps to reproduce

Show overlay with AutoPositionStrategy forcing the content to be flipped.

Result

Animation starts from the top of the content.

Expected result

Overlay should use the opposite animation - from bottom to top.