Enable crossfade animation

Author: Isira-Seneviratne

app/src/main/java/org/schabi/newpipe/App.java

@@ -126,6 +126,7 @@ public ImageLoader newImageLoader() {
                 .allowRgb565(ContextCompat.getSystemService(this, ActivityManager.class)
                         .isLowRamDevice())
                 .logger(BuildConfig.DEBUG ? new DebugLogger() : null)
+                .crossfade(true)
                 .build();
     }