Sequencer: Exposed bool section curve keys

[CL 2705088 by Max Preussner in Main branch]

Engine/Source/Runtime/MovieSceneTracks/Public/Sections/MovieSceneBoolSection.h

@@ -52,6 +52,6 @@ private:
 	/** Ordered curve data */
 	// @todo Sequencer This could be optimized by packing the bools separately
 	// but that may not be worth the effort
-	UPROPERTY()
+	UPROPERTY(EditAnywhere, Category="Curve")
 	FIntegralCurve BoolCurve;
 };