Render state for InstanceStaticMesh doesn't recreate after modification of instances list with RemoveInstance

When Remove Instance is called for an instance static mesh component, the render state is not properly updated, causing some of the instances to not be visible.

Workaround:
Forcing a call to PostEditChangeChainProperty (ex: updating component details) will update the renderer and cause missing instances to become visible

Regression:
Yes - Provided repro steps leave 2 instances in 4.16.3 (CL 3561208)

1. Open UE4 Editor (any project)
2. Add blueprint based on Actor (ActorBP)
3. Add InstanceStaticMeshComponent and set any mesh
4. In class defaults, set Auto Receive Input to Player 0
5. Setup Event Graph as shown in attached screenshot
6. Add instance of ActorBP to the level
7. Pie
8. Press/release Y

Result:
Four instances are added when Y is pressed, then three instances are removed when it is released

Expected:
Only two instances are removed when Y is released

Fix UE-51650

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