[ColorSpectrum] Mirrored when app flow direction is RightToLeft

### Describe the bug

Color Spectrum is mirrored when the FlowDirection is inherited as `RightToLeft`

### Why is this important?

This is just unexpected behavior for the RTL language environment. Graphs still flow LTR, so the color spectrum should still have low hue values on the left and high hue on the right by default.

(If a developer really wants to mirror it, they can explicitly set the FlowDirection on the control, but its default style should override it to LeftToRight)

### Steps to reproduce the bug

Add `FlowDirection="RightToLeft"` at any layer above the ColorPicker or ColorSpectrum.

### Actual behavior

In RightToLeft mode, lower hue values appear on the right

### Expected behavior

Even when in RightToLeft mode, lower hue values should appear on the left

### Screenshots

_No response_

### NuGet package version

None

### Windows version

_No response_

### Additional context

_No response_

Reproduce the issue by applying FlowDirection="RightToLeft" above a ColorPicker or ColorSpectrum, then locate the ColorSpectrum control and its default style. Verify that inherited RTL leaves lower hue values on the left while an explicitly set control direction can still mirror it.

Written by the indexing model from the issue text.