Shadowmask penumbra is different between LightBaker and PVRRuntimeManager

1. Open scene 628 in the Graphics Test project
2. Bake using OnDemand
3. Enter playmode
4. Take screenshot
5. Rebake with Auto
6. Enter playmode
7. Take screenshot
8. Compare

Expected outcome: Output is identical

Actual: There is a difference in the shadow penumbra

Pre-Bake and keep tests 628 and 630 as part of fixing this issue.