Revert "Mostly fix editor GUIs drifting in negative coords"

I've also tried a lot of other things, but none of the solutions I've
tried work 100% of the time. It sounds like a better idea to have
something that doesn't work consistently than to have something that
inconsistently sort of works. Setting the size in `WM_WINDOWPOSCHANGING`
to (0, 0) fixes the drifting, but the mouse coordinates are still wrong
and `SetWindowPos()` breaks the reparenting.

This reverts commit db2cc5800a.

src/wine-host/editor.h

@@ -250,17 +250,6 @@ class Editor {
      */
     const xcb_window_t topmost_window;
 
-    /**
-     * In `fix_local_coordinates()` we send a ConfigureNotify event to the Wine
-     * window with its screen coordinates. Because you're not supposed to do
-     * that directly, we're getting some strange behaviour on some plugins when
-     * the window gets dragged off screen to the left or the top. We perform a
-     * small workaround to mostly correct this issue. This flag indicates
-     * whether we have done this in the last call to `fix_local_coordinates()`,
-     * since we only only need to undo the changes made there once.
-     */
-    mutable std::atomic_bool has_negative_coordinate_correction = false;
-
     /**
      * The atom corresponding to `_NET_ACTIVE_WINDOW`.
      */