refactor(wm): use notopmost flag instead of bottom

It seems like when we use the bottom flag, Rainmeter widgets will be
drawn on top of windows that are managed by komorebi. After looking at
the GlazeWM codebase, where this issue does not occur, it seems like the
difference is made by the use of the notopmost flag.

resolve #679

komorebi/src/windows_api.rs

@@ -357,7 +357,7 @@ impl WindowsApi {
             bottom: layout.bottom + shadow_rect.bottom,
         };
 
-        let position = if top { HWND_TOP } else { HWND_BOTTOM };
+        let position = if top { HWND_TOP } else { HWND_NOTOPMOST };
         Self::set_window_pos(hwnd, &rect, position, flags.bits())
     }