Recycle correctly instead of turning it off

Closes #5841
Fixes #5831

src/org/thoughtcrime/securesms/giph/ui/GiphyAdapter.java

@@ -46,7 +46,6 @@ public class GiphyAdapter extends RecyclerView.Adapter<GiphyAdapter.GiphyViewHol
 
     GiphyViewHolder(View view) {
       super(view);
-      super.setIsRecyclable(false);
       thumbnail   = ViewUtil.findById(view, R.id.thumbnail);
       gifProgress = ViewUtil.findById(view, R.id.gif_progress);
       thumbnail.setOnClickListener(this);
@@ -157,6 +156,12 @@ public class GiphyAdapter extends RecyclerView.Adapter<GiphyAdapter.GiphyViewHol
     }
   }
 
+  @Override
+  public void onViewRecycled(GiphyViewHolder holder) {
+    super.onViewRecycled(holder);
+    Glide.clear(holder.thumbnail);
+  }
+
   @Override
   public int getItemCount() {
     return images.size();