Set Custom Data Value Node Mark Render State Dirty Not Working in Standalone For HISM. Works for ISM

Development Rendering
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Hi, it seems fix is pretty trivial, but you will need sources to fix it.

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Basically editor enforces CPUAccess with GIsEditor and we need to mimic that behaviour, we know how many custom float we will provide in the future, soo using NumCustomDataFloats > 0 should be fine, of course one may use different condition.

Fix is only valid for UE4.27.