Clarify pragma warning comment for outputBitmap ownership transfer

[Copilot]

The pragma warning disable comment in MagicEraser.xaml.cs was misleading about ownership transfer semantics.

Changes:

• Updated comment to clarify that outputBitmap becomes the new _inputBitmap, not that ownership is transferred to the old value

The corrected comment now accurately reflects the code flow:

// outputBitmap's ownership is transferred to become the new _inputBitmap, so it should not be disposed here
#pragma warning disable IDISP001 // Dispose created
var outputBitmap = _eraser.RemoveFromSoftwareBitmap(_inputBitmap, _maskBitmap);
#pragma warning restore IDISP001
if (outputBitmap != null)
{
    _bitmaps.Push(_inputBitmap);  // Old value saved for undo
    _inputBitmap = outputBitmap;   // New value assigned
    // ...
}

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