[2D][Sprite Shape] Sprite shape edge collider has a gap at end point if optimise collider is disabled

Repro steps:
- Open SampleScene
- Notice Sprite Shape Profile gameobject in scene has missing edge collider at the bottom corner
- Enter playmode, observe circle falls off gap in Sprite Shape Profile object
- Exit playmode and enable Optimise Collider in Sprite Shape Profile gameobject, observe there is no gap now
- Enter playmode again, observe circle does not fall off Sprite Shape Profile object

Actual result: Sprite Shape Profile gameobject in scene has missing edge collider at end point
Expected result: Sprite Shape Profile gameobject in scene does not have missing edge collider