ui/app: remove two redundant assignments

StagePaused is the zero value now that StateDead is gone.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

ui/app/os_windows.go

@@ -243,7 +243,6 @@ func createNativeWindow(opts *WindowOptions) (*window, error) {
 	}
 	w := &window{
 		hwnd:  hwnd,
-		stage: StagePaused,
 	}
 	winMap[hwnd] = w
 	w.hdc, err = getDC(hwnd)

ui/app/window.go

@@ -83,7 +83,6 @@ func NewWindow(opts *WindowOptions) *Window {
 
 	w := &Window{
 		events: make(chan Event),
-		stage:  StagePaused,
 	}
 	if err := createWindow(w, opts); err != nil {
 		// For simplicity, NewWindow always succeeds. Send