PIE window resizes on launch when using Windows scaling

The user suggested scaling the TitleBarSize in SWindow::GetClientRectInScreen by GetDPIScaleFactor(), which makes sense to me but doesn't seem to solve the issue entirely.

• Set Windows scaling to 150% (Display Settings -> Scale)
• Set your PIE mode to "new editor window"
• Go in and out of PIE while noticing where the bottom of the PIE window is.

Result: the bottom of the PIE window is slightly lower every time we enter PIE.

Expected: The window position and size is unaffected when going in and out of PIE.