Improve codacy

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

app/src/main/java/com/nextcloud/talk/adapters/messages/MagicPreviewMessageViewHolder.java

@@ -48,7 +48,6 @@ import com.nextcloud.talk.application.NextcloudTalkApplication;
 import com.nextcloud.talk.components.filebrowser.models.BrowserFile;
 import com.nextcloud.talk.components.filebrowser.models.DavResponse;
 import com.nextcloud.talk.components.filebrowser.webdav.ReadFilesystemOperation;
-import com.nextcloud.talk.databinding.ItemCustomIncomingPreviewMessageBinding;
 import com.nextcloud.talk.jobs.DownloadFileToCacheWorker;
 import com.nextcloud.talk.models.database.CapabilitiesUtil;
 import com.nextcloud.talk.models.database.UserEntity;

app/src/main/java/com/nextcloud/talk/models/json/chat/ChatMessage.java

@@ -50,8 +50,6 @@ import kotlin.text.Charsets;
 @Parcel
 @JsonObject
 public class ChatMessage implements ExtendedIMessage, MessageContentType, MessageContentType.Image {
-    private final String TAG = "ChatMessage";
-
     @JsonIgnore
     public boolean isGrouped;
     @JsonIgnore