Removed HDRP Additional Camera data from `Default_VirtualCameraManager`

CHANGELOG.md

 #### Fixed
 
 * CRITICAL : Fixed compilation errors when VFX Graph not present
+* Removed HDRP Additional Camera data from `Default_VirtualCameraManager` to prevent warnings on builds when using URP/BiRP
 
 ## 2020.2.7
 

Resources/Default_VirtualCameraManager.prefab

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