CmdPal: Fix window restore when the window is not WS_EX_TOOLWINDOW (#45877)

## Summary of the Pull Request

This PR checks the window’s actual extended style before saving the
current window size so the offset is calculated correctly. The API used
can return coordinates in different coordinate spaces depending on
whether the window has the `WS_EX_TOOLWINDOW` extended style.

This makes sense in case that settings `WS_EX_TOOLWINDOW` fails, or is
not applied (when debugger is attached).

>
https://learn.microsoft.com/en-us/windows/win32/api/winuser/ns-winuser-windowplacement
> If the window is a top-level window that does not have the
WS_EX_TOOLWINDOW window style, then the coordinates represented by the
following members are in workspace coordinates: ptMinPos