app: guarantee a ConfigEvent for every Window.Configure call

Not only is the client guaranteed a ConfigEvent, but app.Window
can assume that an unsupported decoration change will be corrected
(by a ConfigEvent with Decorated forced to the supported value).

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

app/os_android.go

@@ -1329,9 +1329,7 @@ func (w *window) Configure(options []Option) {
 		if cnf.Decorated != prev.Decorated {
 			w.config.Decorated = cnf.Decorated
 		}
-		if w.config != prev {
-			w.callbacks.Event(ConfigEvent{Config: w.config})
-		}
+		w.callbacks.Event(ConfigEvent{Config: w.config})
 	})
 }