FIndexedCurve::KeyHandlesToIndices not replicated causing crash.

FIndexedCurve::KeyHandlesToIndices is not replicated, and so seems to be permanently out of date. This isn't readily apparent when there are more keys than the default amount, but when removing keys it becomes an obvious issue.

Note, this issue is also present when playing. Adding a break point inside BeginPlay and inspecting the curve will show that KeyHandlesToIndices only contains the number of items setup in the constructor.

1. Create a new C++ class based on AActor.
2. Add a UPROPERTY(EditAnywhere) FRuntimeFloatCurve to the class.
3. In the class constructor two keys to the curve.
4. Create a Blueprint based on the class.
5. Open the Blueprint and remove one value from the curve.
6. Close and reopen the Blueprint editor.
7. View the curve.

Expected: There should be one value on the curve.
Actual: There are two values on the curve display. One is at (0,0) and not connected, the other is the appropriate value.