Remove extraneous assert in LRUCache (#1839)
Remove extraneous assert in LRUCache (#1839)

This removes an assert and related LOG_FATAL if an LRUCache is initialized
with a 0 max size.

Co-authored-by: Joe Maley <16a9a54ddf4259952e3c118c763138e83693d7fd@tiledb.com>
TileDB-Inc/TileDB,TileDB-Inc/TileDB,TileDB-Inc/TileDB,TileDB-Inc/TileDB