GetRemoteFileTask: pass User directly instead of account

Needed after model changes in master

Signed-off-by: Álvaro Brey Vilas <alvaro.brey@nextcloud.com>

src/main/java/com/owncloud/android/ui/asynctasks/GetRemoteFileTask.kt

@@ -54,7 +54,7 @@ class GetRemoteFileTask(
                     false,
                     true,
                     storageManager,
-                    user.toPlatformAccount(),
+                    user,
                     context
                 )
                 synchFolderOp.execute(client)