Drop dead folder restore code (#5517)

The inner function _folder_restore has been converted to a Job with
PR #4802. The inner function is no longer used. Drop this dead code.

supervisor/backups/backup.py

@@ -696,63 +696,6 @@ async def restore_folders(self, folder_list: list[str]) -> bool:
         """Backup Supervisor data into backup."""
         success = True
 
-        async def _folder_restore(name: str) -> bool:
-            """Intenal function to restore a folder."""
-            slug_name = name.replace("/", "_")
-            tar_name = Path(
-                self._tmp.name, f"{slug_name}.tar{'.gz' if self.compressed else ''}"
-            )
-            origin_dir = Path(self.sys_config.path_supervisor, name)
-
-            # Check if exists inside backup
-            if not tar_name.exists():
-                _LOGGER.warning("Can't find restore folder %s", name)
-                return False
-
-            # Unmount any mounts within folder
-            bind_mounts = [
-                bound.bind_mount
-                for bound in self.sys_mounts.bound_mounts
-                if bound.bind_mount.local_where
-                and bound.bind_mount.local_where.is_relative_to(origin_dir)
-            ]
-            if bind_mounts:
-                await asyncio.gather(
-                    *[bind_mount.unmount() for bind_mount in bind_mounts]
-                )
-
-            # Clean old stuff
-            if origin_dir.is_dir():
-                await remove_folder(origin_dir, content_only=True)
-
-            # Perform a restore
-            def _restore() -> bool:
-                try:
-                    _LOGGER.info("Restore folder %s", name)
-                    with SecureTarFile(
-                        tar_name,
-                        "r",
-                        key=self._key,
-                        gzip=self.compressed,
-                        bufsize=BUF_SIZE,
-                    ) as tar_file:
-                        tar_file.extractall(
-                            path=origin_dir, members=tar_file, filter="fully_trusted"
-                        )
-                    _LOGGER.info("Restore folder %s done", name)
-                except (tarfile.TarError, OSError) as err:
-                    _LOGGER.warning("Can't restore folder %s: %s", name, err)
-                    return False
-                return True
-
-            try:
-                return await self.sys_run_in_executor(_restore)
-            finally:
-                if bind_mounts:
-                    await asyncio.gather(
-                        *[bind_mount.mount() for bind_mount in bind_mounts]
-                    )
-
         # Restore folder sequential avoid issue on slow IO
         for folder in folder_list:
             try: