mobile DOF setting is not applied when play on standalone mode

In 5.0, the mobile depth of field settings were correctly reflected when running standalone. However, in 5.1, the DOF doesn't appear to be working correctly and the focus is off, causing a blurry image. This issue only occurs in standalone mode and not in mobile preview mode.

refer to attached sample projects and test result screenshots

1. create third person template
2. select Settings > Preview rendering level > Android ES 3.1
3. add post process volume  and select it from Outliner
4. post process volume > check infinite Extent to true
5. post process volume > set Focal Region to 200 and Scale to 1.0
6. play in mobile ES 3.1 standalone mode
7. compare the result between 5.0 and 5.1

[UE-23848] Bug Status

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