fix codacy warning

src/main/java/com/owncloud/android/utils/ErrorMessageAdapter.java

@@ -30,7 +30,6 @@ import com.owncloud.android.operations.CreateFolderOperation;
 import com.owncloud.android.operations.CreateShareViaLinkOperation;
 import com.owncloud.android.operations.CreateShareWithShareeOperation;
 import com.owncloud.android.operations.DownloadFileOperation;
-import com.owncloud.android.operations.GetSharesForFileOperation;
 import com.owncloud.android.operations.MoveFileOperation;
 import com.owncloud.android.operations.RemoveFileOperation;
 import com.owncloud.android.operations.RenameFileOperation;