Unbind files on the reply draft for now

There is only one picked_file and this could otherwise upload the wrong file.

Clover/app/src/main/java/org/floens/chan/core/presenter/ReplyPresenter.java

@@ -112,6 +112,8 @@ public class ReplyPresenter implements ReplyManager.HttpCallback<ReplyHttpCall>,
     }
 
     public void unbindLoadable() {
+        draft.file = null;
+        draft.fileName = "";
         callback.loadViewsIntoDraft(draft);
         replyManager.putReply(loadable, draft);