[XR] Update VFXManager asset

Changes triggered by opening the project in 2018.3.0f2

ProjectSettings/VFXManager.asset

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+%YAML 1.1
+%TAG !u! tag:unity3d.com,2011:
+--- !u!937362698 &1
+VFXManager:
+  m_ObjectHideFlags: 0
+  m_IndirectShader: {fileID: 0}
+  m_CopyBufferShader: {fileID: 0}
+  m_SortShader: {fileID: 0}
+  m_RenderPipeSettingsPath: 
+  m_FixedTimeStep: 0.016666668
+  m_MaxDeltaTime: 0.05