app/internal/wm: use Option method to initialize windows

Added (*w.window).Option methods to the backends and use them for setting the initial options passed into NewWindow.

Signed-off-by: pierre <pierre.curto@gmail.com>

app/internal/wm/os_android.go

@@ -676,6 +676,8 @@ func (w *window) ReadClipboard() {
 	})
 }
 
+func (w *window) Option(opts *Options) {}
+
 func (w *window) SetCursor(name pointer.CursorName) {
 	w.setState(func(state *windowState) {
 		state.cursor = &name