Fix one typo in test_lib/lib_get_storage_capacity()
Fix one typo in test_lib/lib_get_storage_capacity()

zstackio/zstack-woodpecker,zstackorg/zstack-woodpecker,zstackio/zstack-woodpecker,zstackorg/zstack-woodpecker,zstackio/zstack-woodpecker,zstackorg/zstack-woodpecker