Incorrect scalingstrategy in autoscaler

[nwangfw]

🐛 Describe the bug

switch pa.Spec.ScalingStrategy {
case autoscalingv1alpha1.HPA:
	// initialize all kinds of autoscalers, such as KPA and APA.
	// TODO Currently, we initialize kpa with default config and allocate window with default length.
	//  We then reallocate window according to pa until UpdateScalingContext.
	//  it's not wrong, but we allocate window twice, to be optimized.
	autoScaler, err = scaler.NewKpaAutoscaler(0, &pa)

In the current pod autoscaler switching logics, we choose HPA but use KPA inside. It should be KPA in the case selection.

Steps to Reproduce

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Expected behavior

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Environment

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